a drunk person; someone who is intoxicated
駅前で酔っ払いが道に倒れていた。
A drunk was lying collapsed on the road in front of the station.
祭りでは酔っ払いが多いので、子どもから目を離さないでください。
There are many drunk people at the festival, so don't take your eyes off your children.
酔っ払いに絡まれて困ったことがある。
I've had trouble with a drunk person bothering me.