This is the 6029th most frequent Japanese word.
アーム
"アーム" (āmu) means "arm."
Here, 'アーム' is used to refer to the mechanical arm of a robot.
ロボットのアームが物を持ち上げた。
The robot's arm lifted an object.
In this sentence, 'アーム' refers to the anatomical arm of a person.
ジムでアームの筋肉を鍛えるトレーニングをした。
I did exercises to strengthen the arm muscles at the gym.
'アーム' in this case refers to the armrest of furniture, such as a sofa.