expression, godan verb (-su)
lean forward; bend forward; hang out
Used when someone leans their upper body forward, often out of curiosity, excitement, or to get a better view. Can also describe leaning out over a balcony or window.
彼は話に興味を持って、身を乗り出した。
He leaned forward with interest in the story.
バルコニーから身を乗り出して下を見ないでください。
Please don't lean out over the balcony and look down.