Wordnet 3.0
ADJECTIVE (1)
1.
out of balance or out of adjustment;
- Example: "the front wheel of my bicycle is out of whack"
The Collaborative International Dictionary of English v.0.48:
Whack \Whack\, n.
1. A smart resounding blow. [Colloq.]
[1913 Webster]
2. A portion; share; allowance. [Slang]
[Webster 1913 Suppl.]
3. an attempt; as, to take a whack at it. [Colloq.]
[PJC]
Out of whack, out of order. [Slang]
[Webster 1913 Suppl.]
WordNet (r) 3.0 (2006):
out of whack
adj 1: out of balance or out of adjustment; "the front wheel of
my bicycle is out of whack"