気がつく, 気が付く, きがつく
Conjugated: 気がついた
Expression, Godan verb
1. to notice, to realize, to realise, to become aware (of), to perceive, to sense, to suspect
2. to be attentive, to be scrupulous, to be observant
3. to regain consciousness, to come to (one's senses), to come round
何時間もたって彼は気がついた。