one's profession; one's line of work
Meanings
2 senses · 6 examplesnoun
one's longtime profession; one's original trade
Refers to the trade or profession a person has been engaged in for a long time and is highly skilled at.
He was originally a doctor; teaching is not his profession.
This chef says running a restaurant is his original trade.
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Although he's retired, when the conversation turns to his profession, he still talks endlessly.
noun
one's current job or line of work
Refers to the work one is currently doing. Often used in phrases like '三句话不离本行' (can't talk without mentioning one's job).
He truly can't talk without mentioning his line of work; before long he started talking about his programming project again.
As a manager, he must be very familiar with the business of his field.
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Having just changed careers, he is not very familiar with the new company's line of business.