Of uncertain origin, possibly from Old French 'purer' (to purify/pour) — one of English's common words with no agreed etymology.
To flow rapidly in a steady stream; to cause liquid to flow from a container.
Of uncertain origin. Possibly from Old French 'purer' (to sift, pour out), from Latin 'pūrāre' (to purify). Or possibly from an unrecorded Old English word. The etymology remains debated.