ˈ ̷ ̷ˌ ̷ ̷ noun
( -s )
Etymology: run in
1. : something inserted as a substantial addition in copy or typeset matter
2. Britain : the finish of a race or hunt
3. : tiff , altercation , quarrel
run-ins of tourists with taximen — A.D.Sheffield
4. : the operation of running in a new engine or machine