be wearing [teacher's etc.] hat



be wearing your [teacher's/lawyer's etc.] hat

  also have your [teacher's/lawyer's etc.] hat on
to be acting as you do when you are working as a teacher, lawyer etc., which may be different from the way you act in other situations I was wearing my teacher's hat at the meeting.
See also: hat, wearing

Common Names:

NameGenderPronouncedUsage
Jovanka-Serbian, Macedonian
SebastiÁNse-bah-STYAHNSpanish
HansHAHNS (German, Dutch)German, Dutch, Swedish, Norwegian, Danish
Golnar-Persian
Inmaculada-Spanish
DieudonnÉEdyuu-do-NEFrench