= sth. that can be bought and sold
Fish were a vital commodity in growing towns and cities where food supplies were a constant concern.
She's an acquisitive person，always wanting to gain and possess new things.
= being too interested in someone's own abilities or appearance
Reece wants the job purely for the reason of vanity.
tighten one's belt
Joel had to tighten his belt since he lost his job.
>> do sth. on a shoe string
= do sth. using very little money
This business is run on a shoestring.
cannot afford sth.
They can't afford such expensive holidays.
>> be beyond sb. 's means
= be too expensive for sb.
The medical charges are beyond the means of needy families.
The hotel we stayed in was dirt-cheap, but our room was very nice.
>> a bargain
= a hover-than-usual price
These shoes are a bargain at just 15 pounds.
>> be undervalued
= be considered to be worth less than sth. really is
Smell is probably the most undervalued sense in many cultures.
go on a shopping spree
Rasie went on a shopping spree this weekend.
= the activity of looking at things in shop windows but not buying anything
Window-shopping is fun for some and frustrating for others.光看不买的行为对一些人来说是种乐趣，而对另一些人来说则十分讨厌了。
keep track of sth.
Scarlett found it hard to keep track of her expenses.
>> loss track of sth.
= fail to keep track of sth.
Kaya never lost track of her favourite celebrities.
We tried to raise eighty thousand pounds，but unfortunately we fell short by about ten thousand.
>> fall short of one's expectations
= is disappointing to someone
He kept falling short of my expectations.
Only... won't balk at this price.
Only well-heeled business people won't balk at this price, especially when buyers can get just 3 hours of battery life.
>> a prohihitive price
= a price that is too high for the average people
The price of land in London is prohibtive.
The laptop looks pretty cool and this is the closest I've ever got to actually coveting a Dell laptop.
>> envy sb.
= want very much to do sth. that sb. else does
I envy people who are always optimistic.
The UN provided financial support to the refugees.
>> financial aid
= money that an organisation or a government gives to a country or an area
Some people believe that the government should spend less on overseas financial aid.
>> financial issue
= financial subject that people discuss
Financial issues are critical to the government.
keep up with the Joneses
This society has been having a "keeping up with the Joneses" complex for years and now it's crashing down around its people.
>> peer pressure
= the influence other people of your age have on the way you behave
Peer pressure can be very disorienting for children.