back-pedal
v (-ll-; US -l-)
1 [I] pedal backwards on a bicycle, etc 倒蹬(自行车等).
2 [I, Ipr] ~ (on sth) (fig 比喻) withdraw from an earlier statement or policy; reverse one´s previous action 背弃以前的言论或政策; 变卦
The Government are back-pedalling on their election promises. 内阁正在背弃它竞选时的诺言.