live on an amount of money

live on

1. To use some resource as one's means of survival or financial security. I guess we should be glad to get anything at all from social welfare, but how do they expect us to live on $300 a month? I had to live on berries and birds' eggs while I was stranded in the wilderness.
2. To continue to survive or endure. Everyone thought print books would vanish with the rise of eBook readers, but printed media lives on even now.
3. To remain in people's memory after someone dies or something ceases. We'll all miss her terribly, but the memory of our grandmother will live on in everyone who knew and loved her. Even twenty years after the war ended, fear of the enemy lives on in this country.
See also: live, on
Farlex Dictionary of Idioms.

live on an amount of money

to live on a specific amount of money; to manage to live on a specific amount of money. Can you live on only that much money? I can live on a very small amount of money.
See also: amount, live, money, of, on
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • (I'm) (so) glad you could come
  • glad you could come
  • be glad to see the back of (someone or something)
  • be glad to see the back of someone or something
  • be glad, etc. to see the back of somebody/something
  • in (one's) glad rags
  • in your glad rags
  • Am I glad to see you!
  • (boy,) am I glad to see you!
  • so