Source : WordNet®

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}]