The Collaborative International Dictionary
Out of whack
Whack \Whack\, n.
A smart resounding blow. [Colloq.]
A portion; share; allowance. [Slang]
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an attempt; as, to take a whack at it. [Colloq.]
Out of whack, out of order. [Slang]
Wiktionary
out of whack
a. 1 (context idiomatic English) wrong, broken; specifically: 2 # Not in proper balance; unbalanced. 3 # Not in proper alignment. 4 # Not working or operating properly.
WordNet
out of whack
adj. out of balance or out of adjustment; "the front wheel of my bicycle is out of whack"