rat

²rat

verb

rat·tedrat·ting

Definition of RAT

intransitive verb

1

: to betray, desert, or inform on one's associates —usually used with on

2

: to catch or hunt rats

3

: to work as a scab

transitive verb

1

: to give (hair) the effect of greater quantity (as by use of a rat)

2

: to inform on : turn in —usually used with out <ratted out his accomplice>

Examples of RAT

1. The teacher knows what we did, which means that somebody ratted.

First Known Use of RAT

1812