Englishfor English speakers
arm
Noun
—
One of the upper limbs people have; arms start at the shoulder and go down to the wrist, sometimes the hand is included.
—
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.
—
To get a tool or a weapon ready for action; to activate.
Remember to arm the alarm system.
an
Determinative
—
An (or a) is used when the following word could be any of a certain type.
I just ate an apple.
It is indeed an honor to have met you today.