*whiff of something
1. . Lit. the smell or odor of something. (*Typically: get ~; catch ~; have ~; take ~; give someone ~.) Did you get a whiff of the turkey roasting? Yummy. I caught a whiff of something rather unpleasant in the attic. I think there is a dead mouse up there.
2. . Fig. a bit of knowledge of something. (*Typically: get ~; catch ~; give someone ~.) The boss got a whiff of the problems in the accounting department. No one will get a whiff of your trouble with the police. I'll see to that.