Englishfor English speakers
assistant
Noun
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An assistant is a person who helps (or assists) another person.
The doctor's assistant held his tools.
assistant
Adjective
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If you are assistant, you have a position under someone.
The assistant guard was in training to become a full guard.
doctor
Noun
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A person who helps people who are sick, and looks after their health.
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A person who can work very well about a particular thing and is given the title Doctor by a university, for example a doctor in psychology could be called Doctor John Smith.
doctor
Verb
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If you doctor someone, you act as a medical doctor towards them.
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If you doctor something or someone, you change them.