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
Atto['ætəu]
Unnr-Ancient Scandinavian
Makar-Russian
Sophronios-Late Greek
Korneliakawr-NE-lee-ah (German), kawr-NEL-yah (Polish)German, Polish
Uilliam-Irish