to sense; to suspect; to get an inkling (of something); to get wind of; to smell (e.g. danger); to become aware of (e.g. a plot)
刑事は動機に感付いた。
The detective sensed the motive.
猫は天気の異変に感付いている。
The cat is sensing a change in the weather.
熟練の交渉人は相手の態度の変化に即座に感付く。
A skilled negotiator instantly senses shifts in the opponent's stance.