1. Tool. Replaceable, interchangeable working end of a rotary tool. Drill bit,
router bit, screw bit.
2. Acting. Piece of onstage business or routine. Comedy bit. From
http://comedians.about.com/od/glossary/g/bit.htm :
A 'bit' in stand-up comedy is an individual routine on a certain topic; if a comic's set is like a rock album, consider a bit as an individual song. A series of bits add up to a complete set.
3. Equestrian. The metal part of a horse's
bridle that goes in the mouth. Bit and bridle.
4. General. A small amount. Director to
LD, "Can we have the
cyc just a bit more green?" LD to Director, "We
can, but seeing as how I have zero green cyc lights up there, that's going to be a bit of a challenge."