cog 1
/kog, kawg/ , n. , v. , cogged, cogging .
n.
1. (not in technical use) a gear tooth, formerly esp. one of hardwood or metal, fitted into a slot in a gearwheel of less durable material.
2. a cogwheel.
3. a person who plays a minor part in a large organization, activity, etc.: He's just a small cog in the financial department.
v.i.
4. (of an electric motor) to move jerkily.
v.t.
5. to roll or hammer (an ingot) into a bloom or slab.
6. slip a cog , to make a blunder; err: One of the clerks must have slipped a cog.
[ 1200-50; ME cogge, prob. kugg cog ]
cog 2
/kog, kawg/ , v. , cogged, cogging .
v.t.
1. to manipulate or load (dice) unfairly.
v.i.
2. to cheat, esp. at dice.
[ 1525-35; orig. uncert. ]
cog 3
/kog, kawg/ , n. , v. , cogged, cogging .
n.
1. Carpentry. (in a cogged joint) the tongue in one timber, fitting into a corresponding slot in another.
2. Mining. a cluster of timber supports for a roof. Cf. chock (def. 4).
v.t. , v.i.
3. Carpentry. to join with a cog.
[ 1855-60; special use of COG 1 ; r. cock in same sense, special use of COCK 1 (in sense of projection); see COAK ]