v.1. To drop or descend from the top of something: I fell off the ladder and bruised my knee.
2. To become less; decrease: Stock prices fell off markedly, resulting in a loss for thousands of accounts. The number of staff meetings fell off after a few months as our initial enthusiasm waned. I started a new diet and the pounds fell off.
3. To lose weight. Used of livestock: Toward the end of the dry season, the cattle fall off rapidly.
4. Nautical To change course to leeward: We have a lot of pressure on the sail; let's fall off a little.