bet one's bottom dollar

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bet one's bottom dollar (third-person singular simple present bets one's bottom dollar, present participle betting one's bottom dollar, simple past and past participle bet one's bottom dollar)

1. (slang, idiomatic) To be absolutely sure of something; to be certain enough of something to wager everything.

   Synonyms: bet a dollar to a doughnut, bet one's boots, bet one's life, bet the farm, stake one's life

   He talks about it a lot, but I would bet my bottom dollar that he has never actually been there.

   • 1923, Agatha Christie, The Murder on the Links:

     But I’ll bet my bottom dollar that you’re wrong.

   • 1977, “Tomorrow”, in Martin Charnin (lyrics), Annie:

     The sun'll come out Tomorrow Bet your bottom dollar That tomorrow There'll be sun!