noun
bad breath; intimation
Primarily used for bad breath; the 'intimation' sense is rare and literary, suggesting a hint or subtle indication conveyed through one's breath or manner.
口気が気になるので、歯医者に行った。
I was concerned about my bad breath, so I went to the dentist.
彼の口気からは、何か隠しているような気配が感じられた。
From his intimation, I sensed he was hiding something.