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
Knute-Norwegian
Yasmeen-Persian, Arabic
GreerGREERScottish, English (Rare)
Angeliaan-JEL-ee-əEnglish
Shreya-Indian, Hindi, Marathi, Bengali, Gujarati
German (2)GYER-mahnRussian