11) back down

to admit that you were wrong or that you have been defeated يعترف بالخطأ او الهزيمة Eventually, Roberto backed down and apologized Local residents have forced the local council to back down from/on its plans to build a nightclub in their street

12) back off

to stop being involved in a situation, usually in order to allow other people to deal with it themselves ينسحب او يتوقف عن She started to criticize me, then she suddenly backed off Just back off and let us do this on our own, will you?

13) back off

to move backwards away from someone, usually because you are frightened يرجع الى الخلف بسبب الخوف خاصة I saw the knife and backed off

14) back onto

faces something from the back يقابل و لكن من الجهة الخلفية و ليس الامامية The house backs onto a narrow alley

15) back out

to decide not to do something that you had said you would do يقرر عدم القيام بعمل قال مسبقا انه سيقوم به You agreed to come. You can't back out now They backed out of the deal the day before they were due to sign the contract

16) back up

to support or help someone يدعم او يساعد My family backed me up throughout the court case

17) back up

to prove something is true يثبت صحة شيء ما

His claims are backed up by recent research

18) bawl out

to tell someone angrily that something they have done is wrong ينتقد

He's always bawling out people in meetings

19) bear down

on to move in a threatening way towards someone or something يتحرك باتجاه شخص او شيء مشكلاً خطر I looked up to see the car bearing down on me, out of control

20) bear on

to be connected or related to يكون ذو صلة او علاقة I don't see how that information bears on this case