dead giveaway

something that reveals a fact or an intention completely. The car in the driveway was a dead giveaway that someone was at home.

Name	Pronounced	Usage
Sidonius	-	Late Roman
Aubin	-	French
Theo	THEE-o (English), TAY-o (Dutch)	English, Dutch
Perkins	['pɜ:kinz]
Chizqiyahu	-	Biblical Hebrew
&Thorn;ÓRfastr	-	Ancient Scandinavian