run-in

Significado (inglés)

Noun

1. An encounter; a scrape or brush, especially one involving trouble or difficulty.
2. The end-phase of a competition etc.

Adj

1. (not comparable) Having been run in before or behind previous text.
2. (sometimes comparable) Having been run in to seat the parts.

Sinónimos

row

quarrel

fight

clash

wrangle

dustup

words

skirmish

fray

fuss

grind down

rough-and-tumble

scrimmage

scuffle

set-to

squabble

strife

struggle

use

wear down

wear off

wear out

brawl

conflict

brush

contention

dispute

dogfight

encounter

face-off

fracas

Etimoloxía (inglés)

Derived from the verb run into.
For the meaning "end-phase", it presumably comes a marathon race, where in the final part the runners run into the stadium and complete a lap.