If you mull something, you think about it for a long time before deciding what to do.
①I have not decided yet,I am mulling it over in my mind.
②I'm going to spend the weekend mulling over my options.
③As it happens, however, they are currently mulling over just this sort of incident.
作为动词，可以表示“（尤指作出重大决定前）慎重考虑，仔细思考 ”，英文释义是：If you deliberate, you think about something carefully, especially before making a very important decision.
She deliberated over the decision for a long time before she made up her mind.
[scode type="green"]set back[/scode]
①If something sets you back or sets back a project or scheme, it causes a delay.【使推迟;使延误;耽误】
② If something sets you back a certain amount of money, it costs you that much money.【使花费;使破费】
①It has set us back in so many respects that I'm not sure how long it will take for us to catch up.
②In 1981 dinner for two in New York would set you back £5.
1981 年的时候,在纽约两个人吃一顿饭要花费 5 英镑。
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①shell out （for）为…花费一大笔钱；付钱
【If you shell out for something, you spend a lot of money on it.】
You won't have to shell out a fortune for it.
【If you cannot run to a particular item, you cannot afford to buy it or pay for it.】
If you can't run to champagne, buy sparkling wine.
③spring for 付钱，为……买单
【to pay for someone else’s share of something】
Thank god. You made me spring for that surveillance camera. I wanted to spend money on a pinball machine.
④stump up for (常指不情愿地)付钱，掏腰包
【If you stump up a sum of money, you pay it, often unwillingly.】
Customers do not have to stump up any cash for at least four weeks.