We found 8 dictionaries that define the word go off the deep end:

General (7 matching dictionaries)

1. go off the deep end: Merriam-Webster
2. go off the deep end: Oxford Learner's Dictionaries
3. go off the deep end: Collins English Dictionary
4. go off the deep end: Cambridge Advanced Learner's Dictionary
5. go off the deep end: Dictionary.com
6. go off the deep end: TheFreeDictionary.com

Miscellaneous (1 matching dictionary)

7. go off the deep end: Idioms

Phrases: go in off the deep end, more... ▸ Words similar to go off the deep end ▸ Usage examples for go off the deep end ▸ Idioms related to go off the deep end ▸ Wikipedia articles (New!) ▸ Words that often appear near go off the deep end ▸ Rhymes of go off the deep end ▸ Invented words related to go off the deep end