Common Mistakes : Arm

 noun

:N1

.BAD: The plan to reduce the arm forces is strongly opposed

.GOOD: The plan to reduce the armed forces is strongly opposed

armed = having one or more weapons

.Both hijackers are believed to be armed

the armed forces = (a country’s) army, navy, and air force

:N2

.BAD: She wouldn’t stop crying until I held her on my arms

.GOOD: She wouldn’t stop crying until I held her in my arms

.BAD: I shall never forget the day he died on my arms

.GOOD: I shall never forget the day he died in my arms

(hold sb/sth) in your arms (NOT on)

.He had a great pile of books in his arms