Evolution of sense unclear; may be literally “to shave/trim wood to make a beam” or may be “to leave/lure someone from a workshop”, Frankish *balko perhaps also meaning “workshop”.
Possible corruption by way of Anglicised French term bord: kerb crawling as a synonym for prostitution. Parallels in modern German: Bordsteinschwalbe. English words bawd, bawdiness may be similarly connected.

• IPA: /dɪˈbɔːt͡ʃ/

debauch (plural debauches)

1. An individual act of debauchery.
2. An orgy.
   • 1934 George Orwell, Burmese Days:

     "The flowers, oppressive to the eyes, blazed with not a petal stirring, in a debauch of sun."

• French: débauche
• German: Ausschweifung
• Russian: дебо́ш
• Spanish: corrupción

debauch (debauches, present participle debauching; past and past participle debauched)

1. (transitive) To morally corrupt (someone); to seduce.
2. (transitive) To debase (something); to lower the value of (something).
   • 1685, Matthew Prior, “A Satyr on the modern Translators”, in H. Bunker Wright, Monroe K. Spears, editors, The Literary Works of Matthew Prior, volume I, Second edition, Oxford: Clarendon Press, published 1971, page 19:

     Those who with nine months toil had spoil’d a Play,
     In hopes of Eating at a full Third day,
     Justly despairing longer to sustain
     A craving Stomach from an empty Brain,
     Have left Stage-Practice, chang’d their old Vocations,
     Atoning for bad Plays, with worse Translations,
     And like old Sternhold with laborious spite,
     Burlesque what nobler Muses better write:
     Thus while they for their Causes only seem
     To change the Channel, they corrupt the Stream.
     So breaking Vintners to increase their Wine,
     With nauseous Drugs debauch the generous Vine:
     So barren Gipsies for recruit are said,
     With Strangers Issue to maintain the Trade;
     But lest the fair Bantling should be known,
     A daubing Walnut makes him all their own.

3. (intransitive) To indulge in revelry.

• French: débaucher
• Russian: развращать

• Russian: унижа́ть

• balk