Question 1

What does "rule out" mean?

Accepted Answer

to decide that something is not possible or cannot be true

Question 2

How do you use "rule out" in a sentence?

Accepted Answer

The tests ruled out a serious infection.

Question 3

Is "rule out" formal or informal?

Accepted Answer

"rule out" is register-neutral — appropriate in both casual and formal contexts. Very common in everyday English, medicine, police work, and planning. Often used with possibilities, causes, options, and candidates.

rule out

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