1. Lasting, open, or operating through the whole night
   "an all-night pharmacy"
   - nightlong, overnight

See also: long

• upside
• upside-down
• upside-down cake
• upsilon
• upskill
• upslope
• upstage
• upstager
• upstair
• upstairs
• upstanding
• upstart
• upstate
• upstream
• upstroke
• upsurge
• upsweep
• upswept
• upswing
• upsy-daisy
• uptake
• upthrow
• upthrust
• uptick
• uptight