pull in one's horns
  收斂氣焰,軟下來,打退堂鼓
  pull in one's horns
       v : make a retreat from an earlier commitment or activity;
           "We'll have to crawfish out from meeting with him"; "He
           backed out of his earlier promise"; "The aggressive
           investment company pulled in its horns" [syn: retreat,
           pull back, back out, back away, crawfish, crawfish
           out, withdraw]