if it's the last thing I do

if it's the last thing I do

Used to emphasize one's dedication to achieving something or completing some action. I swear, Father, I will avenge you and the rest of our family, if it's the last thing I do! I've been training all my life in this sport. By God, I'm going to win a gold medal if it's the last thing I do! Nikki is the love of my life, and I will prove to her that I'm a changed man, if it's the last thing I do.

See also: if, last, thing

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