back down
phrasal verbback down (on/from something) 
(North American English also back off)
- to take back a demand, an opinion, etc. that other people are strongly opposed to; to admit defeat- She refused to back down on a point of principle.
 Extra Examples- He will never back down.
- The committee finally backed down over the issue of spending cuts.
- The government was forced to back down from implementing these proposals.