Fight shy of.

　　At a standstill.

　　Drag one's heels.

　　eg：The shy girl hung back and refused to participate in the contest.

　　中英俚语俗语来源：李斯 ·谏逐客书：“使天下之士，退而不敢西向，裹足不人秦。”

　　同义词：停滞不前 Get bogged down.

　　反义词：争先恐后 The devil take the hindmost.