This is the 2819th most frequent Chinese word.
左手
"Left hand."
In this sentence, "左手" refers to a physical part of the body—the left hand.
我的左手比右手更灵活。
My left hand is more flexible than my right hand.
Here, "左手" is used to indicate the tool or instrument used for an action—writing.
他用左手写字，真厉害！
He writes with his left hand, which is really amazing!
In this example, "左手" is used metaphorically to denote a directional side.