late-night

The compound adjective "late-night" is a transparent combination of two native English words. "Late" originates from the Proto-Germanic lataz, meaning "slow" or "sluggish," which evolved to denote a time occurring after the expected or proper hour. "Night" descends from the Proto-Indo-European nókʷts, a fundamental term for the period of darkness. The logic of the compound is straightforward and literal, directly combining the concept of lateness with the specific timeframe of the night to describe activities, events, or characteristics associated with the deep hours after conventional evening has ended.

Structure: late (after the usual time) + night (period of darkness) - late: From Old English læt (slow, tardy), of Germanic origin. Functions as an adjective modifying the time element. - night: From Old English niht, neaht, of Germanic origin. Functions as a noun specifying the period of time.