n.
Function: verb
Inflected Form: rat · ted ; rat · ting
Date: 1812
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>