Englishfor English speakers
arm
Noun
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One of the upper limbs people have; arms start at the shoulder and go down to the wrist, sometimes the hand is included.
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A weapon.
arm
Verb
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To give or sell weapons to a person, group, or country.
Our taxes pay to arm the military.
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To get a tool or a weapon ready for action; to activate.
Remember to arm the alarm system.
chair
Noun
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A chair is a piece of furniture for one person to sit on.
Please, pull up a chair and sit down.
There were six chairs around the table.
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The person who is in charge of a meeting is the chair of the meeting.
The chair opened the floor to questions.
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A chair is a position of professor in a university.
A chair of Mathematics has opened at London University.
chair
Verb
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If you chair a meeting, you are in charge of controlling it.
The meeting was chaired by the head teacher.