Meaning

noun a man participant in his own marriage ceremony

noun someone employed in a stable to take care of the horses

noun a man who has recently been married

originFrom Middle English grom, grome (“man-child, boy, youth”), of uncertain origin. Apparently related to Middle Dutch grom (“boy”), Old Icelandic grómr, gromr (“man, manservant, boy”), Old French gromme (“manservant”), and also to Middle Dutch grom (“fish guts”), Middle Low German grôm (“fish guts”), from the same Proto-Germanic root. Possibly from Old English *grōm, from Proto-West Germanic *grōm…

Etymology from Wiktionary, CC BY-SA 3.0