diff --git a/packages/kbn-esql-validation-autocomplete/src/definitions/functions.ts b/packages/kbn-esql-validation-autocomplete/src/definitions/functions.ts
index 930e8b0c30837..2eb40e5821a19 100644
--- a/packages/kbn-esql-validation-autocomplete/src/definitions/functions.ts
+++ b/packages/kbn-esql-validation-autocomplete/src/definitions/functions.ts
@@ -2449,6 +2449,21 @@ const mvZipDefinition: FunctionDefinition = {
   }),
   alias: undefined,
   signatures: [
+    {
+      params: [
+        {
+          name: 'string1',
+          type: 'string',
+          optional: false,
+        },
+        {
+          name: 'string2',
+          type: 'string',
+          optional: false,
+        },
+      ],
+      returnType: 'string',
+    },
     {
       params: [
         {
@@ -2549,6 +2564,37 @@ const powDefinition: FunctionDefinition = {
   ],
 };
 
+const repeatDefinition: FunctionDefinition = {
+  type: 'eval',
+  name: 'repeat',
+  description: i18n.translate('kbn-esql-validation-autocomplete.esql.definitions.repeat', {
+    defaultMessage:
+      'Returns a string constructed by concatenating `string` with itself the specified `number` of times.',
+  }),
+  alias: undefined,
+  signatures: [
+    {
+      params: [
+        {
+          name: 'string',
+          type: 'string',
+          optional: false,
+        },
+        {
+          name: 'number',
+          type: 'number',
+          optional: false,
+        },
+      ],
+      returnType: 'string',
+    },
+  ],
+  supportedCommands: ['stats', 'eval', 'where', 'row', 'sort'],
+  supportedOptions: ['by'],
+  validate: undefined,
+  examples: ['ROW a = "Hello!"\n| EVAL triple_a = REPEAT(a, 3);'],
+};
+
 const replaceDefinition: FunctionDefinition = {
   type: 'eval',
   name: 'replace',
@@ -4795,6 +4841,7 @@ export const evalFunctionDefinitions = [
   nowDefinition,
   piDefinition,
   powDefinition,
+  repeatDefinition,
   replaceDefinition,
   rightDefinition,
   roundDefinition,
diff --git a/packages/kbn-esql-validation-autocomplete/src/validation/validation.test.ts b/packages/kbn-esql-validation-autocomplete/src/validation/validation.test.ts
index 88e84aa66f2c8..5bf73462202d7 100644
--- a/packages/kbn-esql-validation-autocomplete/src/validation/validation.test.ts
+++ b/packages/kbn-esql-validation-autocomplete/src/validation/validation.test.ts
@@ -5077,6 +5077,33 @@ describe('validation logic', () => {
         );
         testErrorsAndWarnings('from a_index | eval mv_zip(null, null, null)', []);
         testErrorsAndWarnings('row nullVar = null | eval mv_zip(nullVar, nullVar, nullVar)', []);
+        testErrorsAndWarnings('row var = mv_zip(to_string(true), to_string(true))', []);
+        testErrorsAndWarnings(
+          'from a_index | where length(mv_zip(stringField, stringField)) > 0',
+          []
+        );
+
+        testErrorsAndWarnings(
+          'from a_index | where length(mv_zip(booleanField, booleanField)) > 0',
+          [
+            'Argument of [mv_zip] must be [string], found value [booleanField] type [boolean]',
+            'Argument of [mv_zip] must be [string], found value [booleanField] type [boolean]',
+          ]
+        );
+
+        testErrorsAndWarnings('from a_index | eval var = mv_zip(stringField, stringField)', []);
+
+        testErrorsAndWarnings(
+          'from a_index | eval var = mv_zip(to_string(booleanField), to_string(booleanField))',
+          []
+        );
+
+        testErrorsAndWarnings('from a_index | eval mv_zip(booleanField, booleanField)', [
+          'Argument of [mv_zip] must be [string], found value [booleanField] type [boolean]',
+          'Argument of [mv_zip] must be [string], found value [booleanField] type [boolean]',
+        ]);
+
+        testErrorsAndWarnings('from a_index | sort mv_zip(stringField, stringField)', []);
       });
 
       describe('now', () => {
@@ -10334,6 +10361,51 @@ describe('validation logic', () => {
         testErrorsAndWarnings('from a_index | eval mv_append(null, null)', []);
         testErrorsAndWarnings('row nullVar = null | eval mv_append(nullVar, nullVar)', []);
       });
+
+      describe('repeat', () => {
+        testErrorsAndWarnings('row var = repeat("a", 5)', []);
+        testErrorsAndWarnings('row repeat("a", 5)', []);
+        testErrorsAndWarnings('row var = repeat(to_string(true), to_integer(true))', []);
+
+        testErrorsAndWarnings('row var = repeat(true, true)', [
+          'Argument of [repeat] must be [string], found value [true] type [boolean]',
+          'Argument of [repeat] must be [number], found value [true] type [boolean]',
+        ]);
+
+        testErrorsAndWarnings(
+          'from a_index | where length(repeat(stringField, numberField)) > 0',
+          []
+        );
+
+        testErrorsAndWarnings(
+          'from a_index | where length(repeat(booleanField, booleanField)) > 0',
+          [
+            'Argument of [repeat] must be [string], found value [booleanField] type [boolean]',
+            'Argument of [repeat] must be [number], found value [booleanField] type [boolean]',
+          ]
+        );
+
+        testErrorsAndWarnings('from a_index | eval var = repeat(stringField, numberField)', []);
+        testErrorsAndWarnings('from a_index | eval repeat(stringField, numberField)', []);
+
+        testErrorsAndWarnings(
+          'from a_index | eval var = repeat(to_string(booleanField), to_integer(booleanField))',
+          []
+        );
+
+        testErrorsAndWarnings('from a_index | eval repeat(booleanField, booleanField)', [
+          'Argument of [repeat] must be [string], found value [booleanField] type [boolean]',
+          'Argument of [repeat] must be [number], found value [booleanField] type [boolean]',
+        ]);
+
+        testErrorsAndWarnings('from a_index | eval repeat(stringField, numberField, extraArg)', [
+          'Error: [repeat] function expects exactly 2 arguments, got 3.',
+        ]);
+
+        testErrorsAndWarnings('from a_index | sort repeat(stringField, numberField)', []);
+        testErrorsAndWarnings('from a_index | eval repeat(null, null)', []);
+        testErrorsAndWarnings('row nullVar = null | eval repeat(nullVar, nullVar)', []);
+      });
     });
   });