only son
noun1
A sole male child, whether one among multiple siblings, or one who has no siblings.
- Mr. Doyle, an only son, grew up with the undivided attention of affectionate parents and two doting sisters.1991 November 18, Alessandra Stanley, “The Symbols Spawned by a Killing”, in New York Times:
2
Used other than figuratively or idiomatically: see only, son.
- He was the only son to go to college.
- Related terms
- only child, only daughter