dead giveaway

Unmistakable revealing clue

A dead giveaway is something that unmistakably reveals a hidden truth—a clue so obvious it leaves no doubt: His nervous laughter was a dead giveaway that he was lying.

Dead here intensifies giveaway, meaning something that gives away a secret unintentionally.

Related

telltale sign · caught red-handed · red-handed · tell · body language · leak · revealing · slip of the tongue · writing on the wall · blunder · undeniable · conclusive · slip-up · sign · proof · unmistakable · backtracking · lipstick

Categories
Opposites
obviousness of evidence

dead giveawaysubtle hint

Indirect, understated indication

cryptic clue · trace · indirect evidence · circumstantial evidence

concealment effectiveness

dead giveawaypoker face

Intentionally expressionless look

tight lips · blank slate

concealment success

dead giveawaysealed lips

Refusing to divulge

buried truth · poker face · smoke and mirrors · red herring

Family

given, giver, gives, dead end, deadpan, deadlock, dead, giveaway, deadweight

Familiarity
Top 50,000
Profile
Known to kids · Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G