लस्

Of uncertain origin. The original meaning is "to be lively". Likely from Proto-Indo-European *las- (“eager”); compare Latin lascīvus (“playful; lustful”) and perhaps Ancient Greek λῐλαίομαι (lilaíomai, “to desire; to be eager or anxious”). Alternatively, from Proto-Indo-European *leh₂s-; compare Proto-Slavic *làskati (“to caress, flatter”). Finally, perhaps borrowed from a foreign source.

• (Vedic) IPA^(key): /lɐs/
• (Classical) IPA^(key): /l̪ɐs̪/

लस् • (las)

1. to play; to sport; to frolic; to be lively
2. to shine; to flash; to glitter
3. to appear; to come to light; to arise
4. to sound; to resound
5. to jerk; to twitch
6. to embrace
7. to dance
8. to cause to teach to dance
9. to exercise an art

• Monier Williams (1899) “लस्”, in A Sanskrit–English Dictionary, […], new edition, Oxford: At the Clarendon Press, →OCLC, page 899, column 1.
• William Dwight Whitney, 1885, The Roots, Verb-forms, and Primary Derivatives of the Sanskrit Language, Leipzig: Breitkopf and Härtel, page 147
• Mayrhofer, Manfred (2001) Etymologisches Wörterbuch des Altindoarischen [Etymological Dictionary of Old Indo-Aryan]‎ (in German), volume 3, Heidelberg: Carl Winter Universitätsverlag, page 440
• Mayrhofer, Manfred (1976) Kurzgefasstes Etymologisches Wörterbuch des Altindischen [A Concise Etymological Sanskrit Dictionary] (in German), volume 3, Heidelberg: Carl Winter Universitätsverlag, page 95