We found 3 dictionaries that define the word at ones wits end:

General (3 matching dictionaries)

1. at one's wit's end, at one's wits' end: Merriam-Webster
2. at one's wits' end, at one's wits' end: Collins English Dictionary
3. at one's wit's end, at one's wits' end, at ones wits end: Dictionary.com

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