英语词汇：To scrape the barrel 滥竽充数

To scrape the barrel is to use the worst things or people because nothing or no one else is available.

Examples:

You chose Mark to represent us at the meeting? That's really scraping the barrel.

A: What are you wearing to the wedding?

B: The same dress as last time. I know I'm scraping the barrel. I just can't afford anything new!