Also found in: Thesaurus, Idioms.
1. A foam formed by soap or detergent agitated in water, as in washing or shaving.
2. Froth formed by profuse sweating, as on a horse.
3. Informal A condition of anxious or heated discomposure; agitation: The students were in a lather over the proposed restrictions.
v. lath·ered, lath·er·ing, lath·ers
1. To spread with or as if with lather.
2. Informal To give a beating to; whip.
1. To produce lather; foam.
2. To become coated with lather.
[Probably from Middle English latheren, to wash or soak clothes, from Old English lēthran, to cover with lather; see leu(ə)- in Indo-European roots.]