all in, be

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!
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Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

all in, be

1. Be tired out, exhausted, as in I can't walk another step; I'm all in. [Slang; second half of 1800s]
2. In card games, especially poker, be out of money, as in I'm finished for the night; I'm all in. It refers to having put all of one's money in the pot. In his historical dictionary of slang, J.E. Lighter suggests that the gambling usage, first recorded in 1907, may be the source of the first sense.
See also: all
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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