Meaning

noun a solicitation for money or food (especially in the street by an apparently penniless person)

verb call upon in supplication; entreat

verb make a solicitation or entreaty for something; request urgently or persistently

originFrom Middle English beggin, beggyn, beggyng, (also beggand), present participle of beggen (“to beg”), equivalent to beg + -ing (participle ending).

Etymology from Wiktionary, CC BY-SA 3.0