Upon

usgb/əˈpɑːn/Volume
Left Definition 1 of 4Right
LampPro Tip 1/2
Story BeginningsPlay
Used to start fairy tales, implying a timeless, magical setting. SlideOnce upon a time, in a land far away, there was a talking frog.
LampPro Tip 2/2
Idiomatic ExpressionsPlay
Often found in set expressions that signal something unexpected or accidental. SlideI happened upon an old friend at the market today.