also: はいりぐち
noun
entrance; entry; gate; approach; mouth
General word for a place where one enters: a door, gate, opening, or approach. Also used figuratively for the start of something. The reading いりぐち is standard; いりくち is a common variant. はいりぐち and はいりくち are less frequent but understood.
See also: 出口
駅の入り口はどこですか。
Where is the entrance to the station?
成功への入り口は努力だ。
Effort is the gateway to success.