Meaning of the word "work to rule" in English

What does "work to rule" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

work to rule

US /wɜrk tə ruːl/
UK /wɜːk tə ruːl/
"work to rule" picture

Idiom

an industrial action in which employees do no more than the minimum required by the rules of their contract, in order to intentionally slow down productivity and cause disruption without actually stopping work

Example:
The railway staff decided to work to rule, causing significant delays to train services.
During the protest, the factory workers engaged in a work to rule action.