verb/tɾasnoˈt͡ʃaɾ/
to pull an all-nighter, stay awake all night
“La naturaleza ha destinado la noche como la estacion mas propia de sueño, y nada hay mas perjudicial que trasnochar.” — Nature has designated the night as the most proper period for sleep, and there is nothing more harmful than staying awake all night.
Synonyms: amanecerse, pernoctar
Related: trasnochada, trasnochador
From tras- + noche + -ar, or possibly from a Vulgar Latin *trānsnoctāre, from trāns + nox (genitive singular noctis). Cognate with Galician trasnoitar, Asturian tresnochar.