Look up run-in in Wiktionary, the free dictionary.
Run-in may refer to:
In sports
- The tail-end of a team's regular season, the results of which may be crucial in deciding the team's playoff/promotion/relegation fate; this is often mentioned as such when a certain group of teams that rely on results face each other.
In professional wrestling
- "Run-In", a professional wrestling plot device
In medical research
- Run-in period, a period during a clinical trial where the subject receives no treatment.
In engineering
- Break-in (mechanical run-in), the operating of a new engine (especially that of a motor vehicle) at less than its normal speed until proper working has been established
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