new boy—
1. a schoolboy during his first term at a school:
- Roach was a new boy … Thursgood’s was his second prep school.
2. a person who is new to a position of employment:
- When a new boy showed up, I was the one to show him around.
Cf.: new kid on the block—a person who has recently joined a company, organisation, etc, and does not know how things work yet:
- Please pardon me for being ignorant here with the discussion, I am a new kid on the block.
old boy—
1. (coll.) an old man:
- You could scare the old boy and he’ll spill his tea. He spills things all the time.
2. is used to informally address a close acquaintance:
- I said, “Hooray, old boy!” and slapped him on the back.
3. a former pupil of a particular school or college:
- Brothers In Action is a group of old boys committed to making a difference in the college community.
Cf.: old boys club—said of the clannish loyalty of people who intimately know each other:
- Appointees are often part of the “old boys club” or old friends from college days that can be “trusted.”
4. (Old Boy, euph.) the devil:
- Those who wish to avoid uttering the plain straight name “devil” often call him the “Old Boy.”