Entry 3 senses · 2 variants Webster, 1913 Letch /(lĕch)/ · IPA /lɛt͡ʃ/ v. & n. n. 01 v. & n. See Leach. 1. See Leach. See: Leach 02 n. Strong desire; passion; especially, lust. 1. Strong desire; passion; especially, lust.[Archaic] “Some people have a letch for unmasking impostors, or for avenging the wrongs of others.” — De Quincey. 2. A lecher.[slang] See: lecher