tirpti

Lithuanian

From Proto-Indo-European *terp- (“to be stiff”). Cognate with Proto-Slavic *tьrpnǫti (“to go numb”) (whence Polish cierpnąć (“id”)), Latin torpeō (“to be stiff”); see the Latin for more cognates.^[1]^[2]

The "melt" sense is from the same origin as the "go numb" sense, with sense development "to shiver, tremble" > either "go numb" or "melt".^[3]

tir̃pti (third-person present tense tir̃psta, third-person past tense tir̃po) (intransitive)

Conjugation of *tirpti*
		1^st person	2^nd person	3^rd person	1^st person	2^nd person	3^rd person
		singular vienaskaita			plural daugiskaita
		aš	tu	jis/ji	mes	jūs	jie/jos
indicative tiesioginė nuosaka	present esamasis laikas	tirpstù	tirpsti̇̀	tir̃psta	tir̃pstame, tir̃pstam	tir̃pstate, tir̃pstat	tir̃psta
	past būtasis kartinis laikas	tirpaũ	tirpai̇̃	tir̃po	tir̃pome, tir̃pom	tir̃pote, tir̃pot	tir̃po
	past frequentative būtasis dažninis laikas	tir̃pdavau	tir̃pdavai	tir̃pdavo	tir̃pdavome, tir̃pdavom	tir̃pdavote, tir̃pdavot	tir̃pdavo
	future būsimasis laikas	tir̃psiu	tir̃psi	tir̃ps	tir̃psime, tir̃psim	tir̃psite, tir̃psit	tir̃ps
subjunctive tariamoji nuosaka		tir̃pčiau	tir̃ptum, tir̃ptumei	tir̃ptų	tir̃ptumėme, tir̃ptumėm, tir̃ptume	tir̃ptumėte, tir̃ptumėt	tir̃ptų
imperative liepiamoji nuosaka		—	tir̃pk, tir̃pki	tetir̃psta, tetir̃pstie	tir̃pkime, tir̃pkim	tir̃pkite, tir̃pkit	tetir̃psta, tetir̃pstie

Participles of tirpti

^ Smoczyński, Wojciech (2007), “tir̃pti”, in Słownik etymologiczny języka litewskiego [Etymological Dictionary of the Lithuanian Language]‎^[1] (in Polish), Vilnius: Vilnius University, page 680
^ Fraenkel, Ernst (1955, 1962–1965), “tir̃pti 1.”, in Litauisches etymologisches Wörterbuch, volume II, Heidelberg-Göttingen: Carl Winter and Vandenhoeck & Ruprecht, pages 1100-1
^ Fraenkel, Ernst (1955, 1962–1965), “tir̃pti 2.”, in Litauisches etymologisches Wörterbuch, volume II, Heidelberg-Göttingen: Carl Winter and Vandenhoeck & Ruprecht, page 1101