Meaning of the word "run its course" in English

What does "run its course" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

run its course

US /rʌn ɪts kɔrs/
UK /rʌn ɪts kɔrs/
"run its course" picture

Idiom

1.

to come to a natural end; to develop and finish naturally

Example:
Their relationship had simply run its course.
The doctor said the illness would have to run its course.
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