Etymology
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cleanse (v.)

Old English clænsian "to make clean; purge, purify, chasten; justify," from West Germanic *klainson, from *klainoz (see clean (adj.)). Despite its modern spelling (16c.), it retains its Middle English pronunciation. Related: Cleansed; cleansing.

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Definitions of cleanse

cleanse (v.)
purge of an ideology, bad thoughts, or sins;
Purgatory is supposed to cleanse you from your sins
cleanse (v.)
clean one's body or parts thereof, as by washing;
Synonyms: clean
From wordnet.princeton.edu