Definition of "big boy" in English

Noun

1. Used other than figuratively or idiomatically: see big,‎ boy.

2. A large object or person.

   • I've been dying to get behind the wheel of this big boy.

3. A male child who is considered mature enough for some purpose.

   • You're a big boy now, and big boys go to school.

4. An adult male, considered to be sufficiently mature and independent.

   • He is a big boy and can take care of himself.

5. One who is in a dominant position, such as in business, elite sport, etc.

   • He started a small manufacturing plant, but he couldn't compete with the big boys.