Definition of run-in
(Entry 1 of 2)
1
British
: the final part of a race or racetrack
2
: altercation, quarrel
3
: something inserted as a substantial addition in copy or typeset matter
run in
verb
ran in; run in; running in; runs in
Definition of run in (Entry 2 of 2)
1a
: to insert as additional matter
b
: to make (typeset matter) continuous without a paragraph or other break
2
: to arrest for a usually minor offense
3
chiefly British
: to break in (a new machine) gradually by careful operation
: to pay a casual visit
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Merriam-Webster unabridged
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Time Traveler for run-in
The first known use of run-in was in 1799
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