n.
1.profane or obscene expression usually of surprise or anger
2.a commitment to tell the truth (especially in a court of law)
3.a solemn promise, usually invoking a divine witness, regarding your future acts or behavior
Idiom of the Day
call (someone's) bluff
to challenge someone to prove that what they are saying is true
I decided to call the man's bluff and I asked him to show me the evidence.