- The definition of a lecher is a person who has a large or disgusting interest in sexual activity.
An example of a lecher is someone who constantly needs to have sex.
Origin: Middle English lechoure from Old French lecheur from lechier, to live a debauched life, literally , lick from Frankish an unverified form lekkon, akin to German lecken, to lick
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Origin: Middle English, from Old French lecheor, from lechier, to lick, to live in debauchery, of Germanic origin; see leigh- in Indo-European roots.