This is the 4695th most frequent Chinese word.
瘦
Slim; thin.
Here, "瘦" is an adjective describing someone's physical appearance, specifically being thin or slender.
她看上去很瘦。
She looks very thin.
In this sentence, "瘦" refers to the quality of the steak being lean, without much fat.
这个牛排太瘦了,不够嫩。
This steak is too lean and not tender enough.
Here, "瘦" is used as a verb indicating the action of becoming thinner or losing weight.