This is the 1659th most frequent Japanese word.
腰
"腰" means "waist" or "lower back" in English.
In this sentence, '腰' refers to the lower back region, indicating the physical area affected by injury.
彼は腰を痛めたので、重い荷物を持てません。
Since he hurt his lower back, he cannot carry heavy luggage.
Here, '腰が低い' is an idiomatic expression meaning humility, referring metaphorically to someone's demeanor rather than the physical lower back.
彼女は腰が低くて、誰からも敬われます。
She is humble, and thus respected by everyone.
In this sentence, '腰を据える' is a figurative phrase meaning to settle oneself down, metaphorically describing establishing a firm commitment or focus.