Idioms are phrases which cannot be understood simply by looking at the meaning of the individual words in the phrase.
drum up (something) or drum (something) up
to encourage something by making an effort
The company was able to drum up a lot of business during the summer.
List of common idioms, their meanings and examples of their usage in sentences
An idiom is defined as - a group of words in a fixed order that has a particular meaning that is different from the meanings of each word on its own.