chickening
v．胆怯，退缩：在面对困难或挑战时表现出恐惧或犹豫。
例句
Kate: Wow, rock-climbing is something I often plan to do, but I always end up chickening out!
凯特：我也经常想去做攀岩这样的运动，但最后总是临阵退缩。
