The definition of beat is someone or something that is extremely tired and/or worn out.
Extremely tired; exhausted:
(Not comparable) Full and complete.
Find another word for all-in. In this page you can discover 24 synonyms, antonyms, idiomatic expressions, and related words for all-in, like: in-all, beat, bushed, dead, dead-and-alive, dead-tired, dog-tired, dog-weary, Jephcott, bilson and johnson.