Godan verb with 'ku' ending, Intransitive verb
to notice; to realize; to realise; to become aware (of); to perceive; to sense; to suspect
彼は危険に気づいていなかった。He was unaware of the danger. to regain consciousness; to come to (one's senses); to come round
see 気がつく
Also written 気付く【きづく】