Left Arm
noun
Your left arm is your left arm.
ひだりうで
This is a jukugo word, but it uses kun'yomi instead of on'yomi, so watch out for that!
コウイチの左腕には、トーフグのタトゥーがある。
Koichi has a Tofugu tattoo on his left arm.
左腕を骨折しました。
I broke my left arm.
あれ、あのピッチャー、左腕を痛めてるんじゃかなかったっけ？
Wait a second, didn't that pitcher hurt his left arm?