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3. be all in

be all in

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be all in

1. To be fully committed to a task or endeavor; to give or be prepared to give all of one's energy or resources toward something. Just so you know, I'm all in if you're serious about taking that cross-country trip next week.

2. To be completely exhausted, fatigued, or worn out. I was all in after only the first mile of the race; I could barely even walk for the rest of it!

See also: all

be all in

  (old-fashioned)

to be very tired and unable to do any more I've had six children to look after today and I'm all in.

See also: all