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wear (one's particular profession's) hat
To act as one would in one's particular profession while in a different setting. Bobby, I know you're off duty, but can you please wear your doctor's hat for five minutes and tell me what's wrong with my arm? I don't want to have to go to the hospital. My wife was still wearing her judge's hat when she tried to intervene with our neighbor's arguing kids.
experience is the best teacher
Most wisdom is gained by experiencing different things (compared to acquiring knowledge through schooling or other means). A few years ago, I couldn't even get behind the wheel without having panic attacks, but, with practice, I'm much calmer and can drive with no problems. Experience is the best teacher after all.
experience is the teacher of fools
Foolish people only learn from personal experience, rather than witnessing others' mistakes. After watching Alex's failed attempt at the experiment, I realized what we were doing wrong. Experience is the teacher of fools.
call (oneself) a (something)
A phrase used to show the speaker's incredulity that someone considers themself to be a particular thing, often a friend. And you call yourself a friend? You totally gossiped about me to other people in our class! If she's only working as an intern there, how can she call herself an editor on her resume?
See also: call
no (person) worth their salt would (do something)
No person who warrants respect in a certain field or profession would engage in such bad behavior or activity. No professor worth their salt would remove a student from class just for asking controversial questions. It's baffling—no doctor worth their salt would have missed such an obvious diagnosis.
1. A derogatory term for a teacher's favorite or favored student, typically one who has sought such favor by being ingratiatingly obedient. Jill's classmates called her a teacher's pet after she volunteered to supervise the class while the teacher was away. Being the teacher's pet will get you nowhere when the midterm exam rolls around.
2. By extension, a derogatory term for someone who has gained or attempts to gain the favor of an authority figure, typically in order to obtain preferential treatment. Jeff is the resident teacher's pet in the office. He brings the boss coffee every day.
Experience is the best teacher.
Prov. You will learn more from things that happen to you in real life than you will from hearing about or studying things that happen to other people. I don't care how many books you read about how to run a business; experience is the best teacher. The nurse believed that experience was the best teacher when it came to developing a bedside manner, so she made sure that all her students spent a lot of time with patients.
Experience is the teacher of fools.
Prov. Only fools do not learn after seeing other people's mistakes and insist on repeating them. Father: You should spend more time studying and less time having fun with your friends. If I had been a better student when I was your age, I'd have a better job now. Son: Oh, come on, Dad. School's worthless. Father: Don't make the same mistake I did! Experience is the teacher of fools.
the teacher's favorite student. (*Typically: be ~; become ~.) Sally is the teacher's pet. She always gets special treatment. The other students don't like the teacher's pet.
A person who has gained favor with authority, as in Al has managed to be teacher's pet in any job he has held. This expression transfers the original sense of a teacher's favorite pupil to broader use. [1920s]
no teacher/actor, etc. worth their salt
COMMON If you say, for example, that no teacher worth their salt or no actor worth their salt would do a particular thing, you mean that no teacher or actor who was good at their job would consider doing that thing. No racing driver worth his salt gets too sentimental about his cars. No player worth his salt wants to play in the lower divisions. Note: Instead of no, you can use any or every with this expression. For example, if you say that any teacher worth their salt would do a particular thing, you mean that any teacher who was good at their job would do that thing. Any policeman worth his salt would have made proper checks to find out exactly who this man was. Every teacher worth their salt will learn as much from their students as their students learn from them. Note: In the past, salt was expensive and rare. Roman soldiers were paid a `salarium' or salt money, so they could buy salt and stay healthy.
call yourself a ˈteacher, ˈfriend, etc.?(informal) used to say that you do not think somebody is a very good teacher, friend, etc: Call yourself a friend? Why did you forget my birthday then? ♢ How can he call himself a musician when he’s never even heard of Schubert?
See also: call
Someone who seeks preferential treatment. A derisive epithet hurled at a student who tries to curry a teacher's favor in hopes of a better grade. Such a charge, valid or not, often led to cloakroom or schoolyard challenges and bloody noses. Outside of school, it was applied to people who insinuated themselves to authority in the hope of special treatment. The French equivalent is “teacher's little cabbage.”