Wit  n. 1 (in sing. Or pl.) Intelligence; quick understanding. 2 a unexpected combining or contrasting of ideas or expressions. B power of giving pleasure by this. 3 person possessing such power.  at one's wit's (or wits') end utterly at a loss or in despair. Have (or keep) one's wits about one be alert. Live by one's wits live by ingenious or crafty expedients, without a settled occupation. Out of one's wits mad. To wit that is to say, namely. [old english]