particular

ain't particular 

1. Rur. doesn't or don't care. Tom: Would you rather have ice cream or cheese on your apple pie? Mary: Whatever you're having. I ain't particular.

2. Rur. doesn't or don't have a preference. Jane ain't particular. She'll use any old brand of soap.

Better keep still about it. and Someone had better keep still about it.; Better keep quiet about it.; Someone better keep quiet about it.

A particular person ought not to tell about or discuss something. (The someone can stand for any person's name, any pronoun, or even the word someone meaning "you-know-who." If there is no Someone had, the phrase is a mild admonition to keep quiet about something.) Mary: I saw you with Bill last night. Jane: You'd better keep quiet about it. Jane: Tom found out what you're giving Sally for her birthday. Bill: He had better keep quiet about it!

See also: better, keep, still

Give my best to someone and All the best to someone.

Please convey my good wishes to a particular person. (The someone can be a person's name or a pronoun. See also Say hello to someone (for me).) Alice: Good-bye, Fred. Give my best to your mother. Fred: Sure, Alice. Good-bye. Tom: See you, Bob. Bob: Give my best to Jane. Tom: I sure will. Bye. Bill: Bye, Rachel. All the best to your family. Rachel: Thanks. Bye.

See also: best, give

particulars (of something)

specific details about something. My boss stressed the important particulars of the project. What are the particulars of your request?