[yuè mǎ wān gōng]   

跃    马    弯    弓    驰马盘旋，张弓要射。形容摆开架势，准备作战。后比喻故做惊人的姿态，实际上并不立即行动。

Turn round on one's gallopingsteed and aim an arrow at

跃跃欲试    跃马扬鞭    跃马弯弓    跃然纸上    跃跃欲动