A piece of metal placed in a horse's mouth and connected to the reins to direct the animal. • A rotary cutting tool, fitted to a drill, brace, or router, used to bore or drill holes or to remove material from the profile of the workpiece. • Applied to a various small units of currency and coins. • A coin of a specified value. • A unit of currency worth one eighth of a dollar, originally of a Spanish dollar but later also US or Canadian; also, a coin with this value, in particular the silver Spanish real. • A coin of a value similar but not equal to this, in particular the ‘short bit’, i.e. the ten-cent piece or dime. • A unit of currency and coin of the British West Indies worth six black dogs, originally equal to one-eighth of a Spanish dollar but later increasingly debased to one tenth, one eleventh, one twelfth, etc. • A unit of currency of the Dutch West Indies in the early 20th century, worth one fifth of a cent. • Synonym of microbitcoin. • A small amount of something. • Specifically, a small amount of time. • A small fraction above a whole number. • Fractions of a second. • A portion of something. • Somewhat; something, but not very great; also used like jot and whit to express the smallest degree. See also a bit. • A replaceable tip for a hand tool or power tool, comprising the portion that drives a fastener. • A prison sentence, especially a short one. • An excerpt of material making up part of a show, comedy routine, etc. • A gag or put-on; a humorous conceit, especially when insistently presented as true. • Ellipsis of bit part. • The part of a key which enters the lock and acts upon the bolt and tumblers. • The cutting iron of a plane. • The bevelled front edge of an axehead along which the cutting edge runs. • A gag of a style similar to a bridle. • A gun.