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to run in
[phrase form: run]
01
to take someone suspected of a crime or violation into custody, typically by law enforcement
Informal
Example
The police had to run in the suspect after a high-speed chase.
The officer decided to run the unruly protester in for causing a disturbance.
02
to use the machinery slowly at the start to make sure it works properly
Example
When he got the new car, the manual advised him to run in the engine for the first 1,000 miles.
She carefully ran the sewing machine in by starting with lighter fabrics before tackling heavier ones.
