use one's head

Think, have common sense, as in Use your head, Martin. No one's coming out in this weather. This idiom uses head in the sense of "brain" or "intellect," a usage dating from the late 1300s.

Common Names:

Name	Pronounced	Usage
Vsevolod	FSYE-vah-laht (Russian)	Russian, Ukrainian, Medieval Slavic
ÁGi	-	Hungarian
Atanasije	-	Serbian
Anja	AHN-yah (Swedish, Finnish, Croatian, Serbian, German)	Swedish, Norwegian, Danish, Finnish, Slovene, Croatian, Serbian, German, Dutch
Dmitar	-	Croatian, Serbian
Sylvanus	-	English (Archaic)