Definition
With the head leading or going in front of the rest of the body.
頭先，頭部先行
He jumped head first into the cold river.
他頭朝下跳進了冰冷的河裡。
She accidentally fell head first down the stairs.
她不小心頭朝下從樓梯上摔了下來。
He slid down the water slide head first, splashing water everywhere.
他頭朝下從滑水道滑下來，水花四濺。