(~s)
1.
A ~ to a problem or mystery is something that helps you to find the answer to it.
Geneticists in Canada have discovered a ~ to the puzzle of why our cells get old and die...
N-COUNT: oft N to n
2.
A ~ is an object or piece of information that helps someone solve a crime.
The vital ~ to the killer’s identity was his nickname, Peanuts.
N-COUNT: oft N to n
3.
A ~ in a crossword or game is information which is given to help you to find the answer to a question.
N-COUNT
4.
If you haven’t a ~ about something, you do not know anything about it or you have no idea what to do about it. (INFORMAL)
I haven’t a ~ what I’ll give Carl for his birthday next year.
PHRASE: usu PHR wh