Definition of "Groom" :

noun: a man who has recently been married

noun: a man participant in his own marriage ceremony

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

verb: care for one's external appearance

"He is always well-groomed."

verb: give a neat appearance to

"Groom the dogs."

verb: educate for a future role or function

"He is grooming his son to become his successor."