Third-person singular simple present indicative form of whack.(verb)
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Use "whacks" in a sentence
"Petr Prucha was denied on three whacks from the left post in the second period, and Matt Cullen was frustrated, too, in the third when Vokoun kept a short flip shot out."
"I was a bit rattled when this young party steers in an 'whacks' is cock-an'-bull yarn into me 'and."
"Well, ok, I'm not sure what kind of "whacks" are in store for teachers with "rigorous national certification"."