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): [ˈlʲu̟ʃtʲɐ]

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)

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• лу́щя (lúštja)

• долю́щя pf (doljúštja), долю́щвам impf (doljúštvam)
• залю́щя pf (zaljúštja), залю́щвам impf (zaljúštvam)
• излю́щя pf (izljúštja), излю́щвам impf (izljúštvam)
• олю́щя pf (oljúštja), олю́щвам impf (oljúštvam)
• отлю́щя pf (otljúštja), отлю́щвам impf (otljúštvam)
• полю́щя pf (poljúštja), полю́щвам impf (poljúštvam)
• лющни́к (ljuštník, “spank, slap”) (dialectal)

• 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 [Dictionary of the Bulgarian Language] (in Bulgarian), Sofia: Bulgarian Academy of Sciences, 2014
• “лющя”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Chitanka, 2010
• Georgiev, Vladimir I., editor (1986), “лющя¹, лющя²”, in Български етимологичен речник [Bulgarian Etymological Dictionary] (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. [Dictionary of the Bulgarian language] (in Bulgarian), volume 3, Plovdiv: Дружествена печꙗтница "Съгласие.", page 38