To rule out something is to decide it is not possible and drop it. Rule out foul play, rule out a deal, cannot rule out anything.
It is the standard word in police statements and medical notes, where ruling things out is half the work. The negative form is commoner still, since not ruling something out keeps it open.
1phraserule outTo decide something is not possible and drop it.
“The tests rule out anything more serious.”
rule out is a phrase.
Also accepted in games: exclude, eliminate
Practised in Phrasal Verbs