to manage to live when you do not have enough money and other necessary things

He lost his job, so the family had to scrape by on one small salary. 他丢了工作，所以一家人只好靠一份微薄的工资勉强过活。

to manage with difficulty to get a successful result or to reach an acceptable standard

I only studied Spanish for a year but I can scrape by in most situations. 我只学了一年的西班牙语，但在大多数情况下我都能够勉强应付。