(~s)
1.
A ~ is a warning device which makes a long, loud noise. Most fire engines, ambulances, and police cars have ~s.
It sounds like an air raid ~.
N-COUNT: oft supp N
2.
Some people refer to a woman as a ~ when they think that she is attractive to men but dangerous in some way. (LITERARY)
He depicts her as a ~ who has drawn him to his ruin.
= femme fatale
N-COUNT