2 sentences for 失足 (shī​zú — slip)

1. 他失足前仆，重重地摔在了地上。

   tā shī​zú qián pū, zhòng​zhòng de shuāi zài le dì​shang.

   He tripped and fell forward, hitting the ground hard.

   Source: Dong Chinese Dictionary

2. 他在登山时由于路滑而不慎失足。

   tā zài dēng​shān shí yóu​yú lù huá ér bù​shèn shī​zú.

   He accidentally slipped while climbing the mountain.

   Source: Dong Chinese Dictionary