n.a dive in which the diver arches the back with arms outstretched before entering the water
同义词：swan diveswallow dive
英汉双解大词典
swallow dive
1.
N（名词）
a type of dive in which the diver arches back while in the air, keeping his legs straight and together and his arms oustretched, finally entering the water headfirst 向前直体跳水 (US and Canadian equivalent swan dive)