A pocket knife larger and stronger than a penknife.

大摺刀。

Dive in which the diver bends his body during the dive and straightens out again before hitting the water.

镰刀式跳水(弓身跳水的一种，跳水者在空中弯身，等到入水时再伸直)。

To form a sharp angle with each other, as two railroad cars jumping the track or a cab and trailer after a skid.

使弯曲(铁路箱车等在紧急煞车或滑行时)形成锐角。