Definitions for "Off-width"
Keywords:  chimney, jam, awkward, climber, climb
A crack that is too wide in which to use a hand-jam but not as wide as a chimney. Requires a specialist technique to climb and tend not to be very popular because of this. The ascent of some off-widths are said to require enough energy to light a small town
An awkward sized crack that is too big for decent hand and foot jams, but too small for your entire body.
A crack that is wider than a hand or foot but too narrow for a climber to chimney (fit the whole body) in. Generally 4-10 inches.