something that you say when you add one more of something for no reason.
I want you to swim ten lengths, and one for luck.
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and one (more) for luck
Said when one additional thing is added or done for no apparent reason. Well, little brother, there's your 12 birthday punches—oh, and one more for luck!I was so exhausted after running all those laps that I nearly collapsed when the coach said "and one for luck!"