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Definition of lather
(Entry 1 of 2)
1a : a foam or froth formed when a detergent (such as soap) is agitated in water
b : foam or froth from profuse sweating (as on a horse)
2 : an agitated or overwrought state : dither worked himself into a lather
lather
verbDefinition of lather (Entry 2 of 2)
: to form a lather or a froth like lather
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Time Traveler for lather
The first known use of lather was before the 12th century
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