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(v.) To use a new example of machinery at a low pace to allow the parts to wear into each other.
Run this car in by keeping it under 6,000 rpm for 1,000 miles.
run in by Kung-Fu Jesus May 5, 2004
When a woman spreads her legs and a man runs in.
When his wife laid on the bed with her legs spread. The husband came in from the garage and ran in for a glass of water. He had a run'in
RUN'IN by Donald K. Butters October 31, 2007
The ending period of a football season, (April-May) where usually there is alot on the line to win and lose.
Eden Hazard always performs during the run in period of the Premier League.
run in by ColePalmer91 April 28, 2024

Run in the brain 

Some stupid word people say. It makes them feel cool.
"I always have airpods in it just run in the brain." "OMG your not cool man stfu"

my boy dem run in my gaff 

when the cops raid your crib to look for drugs

The Boy Dem Run in My Gaff 

A UK Slang For The American Slang “The Feds Just Done a Sweep”