1.
If you back off , you move away in order to avoid problems or a fight.
They backed off in horror.
PHRASAL VERB : V P
2.
If you back off from a claim, demand, or commitment that you made earlier, or if you back off it, you withdraw it.
A spokesman says the president has backed off from his threat to boycott the conference...
The union has publicly backed off that demand.
PHRASAL VERB : V P from n , V P n