(1)  Tighten one’s belt = cut one’s expenditure ; live more frugally.

• She said the poor must tighten their belts.
• I’ve had to tighten my belt since I stopped working full-time.

(2)  Make a killing = to earn a lot of money in a short time and with little effort.

• They made a killing with the sale of their London house.
• Tom made a killing at the race track yesterday.

(3)  Well-heeled = wealthy.

• His family was very well-heeled.
• My uncle can afford a new car.  He’s well-heeled.  Everyone in his family is well-off.
• The price tag is out of reach of all but the most well-heeled.