RAT

I. noun see: rodent Date: before 12th century 1. any of numerous rodents ( Rattus and related genera) differing from the related mice especially by considerably larger size, any of various similar rodents, a contemptible person: as, one who betrays or deserts friends or associates, scab 3b, informer 2, a pad over which a woman's hair is arranged, a person who spends much time in a specified place , ~like adjective II. verb (~ted; ~ting) Date: 1812 intransitive verb to betray, desert, or inform on one's associates, to catch or hunt ~s, to work as a scab, transitive verb to give (hair) the effect of greater quantity (as by use of a ~), to inform on ; turn in