get cold feet

back down cancel give up renege surrender

avoid back pedal beg off blow it off chicken out cop out go back on recant resign scratch shy from throw in the towel weasel out wiggle out worm out

avoid back down back out back pedal beg off blow it off bow out cancel cop out funk out give up give way go back on have no stomach for make concessions pull out recant renege resign scratch shy from surrender throw in the towel turn yellow weasel out wiggle out wimp out withdraw worm out yield