BARB

noun

1. The point that stands backward in an arrow, fishhook, etc., to prevent it from being easily extracted. Hence: Anything which stands out with a sharp point obliquely or crosswise to something else.
2. A hurtful or disparaging remark.
3. A beard, or that which resembles it, or grows in the place of it.

verb

1. To furnish with barbs, or with that which will hold or hurt like barbs, as an arrow, fishhook, spear, etc.
2. To cover a horse in armor, corrupted from bard.
3. To cut (hair).