Idioms
An idiom is a group of words, or in other words, a phrase that has a meaning other than its literal meaning of the words in it.
Idiom:
let (something) slide
Meaning:
to neglect a duty, to ignore a situation
Example:
Recently, I have been very busy and I have let my work slide.
List of common idioms, their meanings and examples of their usage in sentences
The language peculiar to a people or to a district, community, or class