to  bet  one's (life / boots / bottom dollar)
bet
bɛts
bets
<i>one's</i>
laɪf
laif
(life / boots / bottom
bu:ts
boots
dollar)
bɒtəm
botēm

英語での「 bet one's life 」の定義と意味

to bet one's life
01

to express strongly and confidently that something is undoubtedly true or will certainly happen 

to [bet] {one's} (life|boots|bottom dollar) definition and meaning
慣用句
くだけた
I'd bet my life he knew about the plan before the meeting. 
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