To strike; to beat; to give a heavy or resounding blow to; to thrash; to make with whacks.

To strike anything with a smart blow.

A smart resounding blow.

the act of hitting vigorously; "he gave the table a whack"

hit hard; "The teacher whacked the boy"

to murder; also clip, hit, pop, burn, put a contract out.

After the Merchant Shipping Act of 1845, with its food allowance tables for seamen, sailors would demand their "whack" or full amount of food from the master if they thought they were being given short rations.

To divide into shares; as, to whack the spoils of a robbery; -- often with up.

a little less than a ton, and a lot more than a bunch

an attempt; as, to take a whack at it.

go, attempt, try

(slang) double (for penalties).

A portion; share; allowance.