лющя

Causative-iterative from nowadays obsolete/dialectal лю́ска (ljúska, “scale, husk”) +‎ -я (-ja) (< Proto-Slavic *ľuska).

Expressive semantics (listed by some dictionary as a separate etymon) is from related interjection люс (ljus, “whoosh”).

• IPA^(key):

лю́щя • (ljúštja) first-singular present indicative, impf

1. (transitive) to husk, to scale, to hull (to remove husks, scales, hulls)
2. (by extension) to exfoliate, to peel
3. (expressive) to smack, to clap, to pound

   ня́кому лю́щя шама́р ― njákomu ljúštja šamár ― to thwack a slap on somebody

4. (reflexive with се) to shed, to slough (of skin, scales, coverring, paint, plaster)

• лу́щя (lúštja)

• лю́скам (ljúskam), лю́свам (ljúsvam), лю́сна (ljúsna) (inchoative)
• лю́хам (ljúham), лю́хвам (ljúhvam), лю́хна (ljúhna, “to smack, to slam”) (colloquial, dialectal)
• лю́згам (ljúzgam, “to hit hard”) (colloquial)
• лю́спя (ljúspja, “to scale”)

• “лющя”, in Речник на българския език (in Bulgarian), Sofia: Bulgarian Academy of Sciences, 2014
• “лющя”, in Речник на българския език (in Bulgarian), Chitanka, 2010
• Georgiev, Vladimir I., editor (1986), “лющя¹, лющя²”, in Български етимологичен речник (in Bulgarian), volume 3 (крес¹ – мѝнго¹), Sofia: Bulgarian Academy of Sciences Pubg. House, page 585
• Nayden Gerov (1899) “лю́щѭ, -ишь; -щи́лъ”, in Рѣчникъ на Блъгарскꙑй язꙑкъ. Съ тлъкувание рѣчи-тꙑ на Блъгарскꙑ и на Русскꙑ. ‎ (in Bulgarian), volume 3, Plovdiv: Дружествена печꙗтница "Съгласие.", page 38