Phrasal verbs

ask after  British English (ask about someone) I met Sophia yesterday, and she asked after your wife’s health. Don’t forget to ask after my brother when you see John.   envocabulary.com  

ask about  American English (to ask how someone is) She asked about your wife’s health. ask about (to ask for information) I called to ask about the schedule.  

back up (to support someone) I’ll back you up throughout the court case.   (to prove that what someone is saying is true) Recent study backs up her claims.   (to make a copy of computer information) Make sure you back up your files every day.   (to move backward) …

back out (to refuse to do something that you had promised to do) Lily made a promise, and she can’t back out of it now. The investor backed out of the deal at the last minute.   – English Vocabulary

back off (to move backward) He saw the knife and backed off.   (to stop bothering someone) Back off, Benjamin! Let me run my own life!   (to not do something that you had agreed to do) Lucas backed off when he realized how much work was involved. – English …