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
ColtenKOL-tənEnglish (Modern)
ChrissieKRIS-eeEnglish
AurÉLia-Hungarian
Harshada-Indian, Hindi, Marathi
ZosiaZAW-shahPolish
Albertusahl-BER-tus (Dutch) Ancient Germanic (Latinized), Dutch