Definitions from Wiktionary ( )

▸ noun:  The sound of a heavy strike.
▸ noun:  The strike itself.
▸ noun:  The stroke itself, regardless of its successful impact.
▸ noun:  (US, slang) An attempt, a chance, a turn, a go, originally an attempt to beat someone or something.
▸ noun:  (originally UK cant, somewhat dated) A share, a portion, especially a full share or large portion.
▸ noun:  (obsolete) A whack-up: a division of an amount into separate whacks, a divvying up.
▸ noun:  (US, obsolete) A deal, an agreement.
▸ noun:  (dated, disco-era drug slang) PCP, phencyclidine (as also wack).
▸ noun:  (slang, computing, typography) The backslash, ⟨ \ ⟩.
▸ verb:  To hit, slap or strike.
▸ verb:  (slang) To assassinate, bump off.
▸ verb:  (transitive, slang) To share or parcel out (often with up).
▸ verb:  (sports) To beat convincingly; to thrash.
▸ verb:  (UK, chiefly in the negative) To surpass; to better.
▸ verb:  (Singapore, Singlish) To attempt something despite not knowing how to do it; to take on a task spontaneously and carelessly without planning.
▸ verb:  (Singapore, Singlish) To eat something hurriedly.
▸ adjective:  Alternative spelling of wack (“crazy”) [(originally African-American Vernacular, slang) Annoyingly or disappointingly bad, in various senses; lousy, corny, cringy, uncool, messed up.]

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