to be able to live or deal with a situation with difficulty, usually by having just enough of something you need, such as money

How can he get by on so little money? 他是怎样靠那么一点儿钱维持生计的？

We can get by with four computers at the moment, but we'll need a couple more when the new staff arrive. 我们眼下可以将就着用4台计算机，但新职员到来时就需要再添置几台了。