one for luck
noun1
An extra repetition of an action beyond what is needed.
- "Here's one for luck, anyway," said one of the others, and he lifted his pistol and fired into the brush. The troop laughed light-heartedly, and turned back toward town. But the shot for luck struck Lean John's horse, and it fell with a groan.1905, Charles Fletcher Lummis, Out West: A Magazine of the Old Pacific and the New:
- As he reached the wicket, Yardley, the England captain, led three cheers (he forgot the 'and one for luck').2013, Simon Hughes, Cricket's Greatest Rivalry: