Definition of in a lather
- Her parents were in a lather when she came home late.
: a foam or froth formed when a detergent (such as soap) is agitated in water
: foam or froth from profuse sweating (as on a horse)
: an agitated or overwrought state : dither
: to spread lather over
: to beat severely : flog
: to form a lather or a froth like lather
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