To stop walking or moving; to come to a halt or pause in one's tracks (intransitive).
バス停で人が多くて、みんな立ち止まって待っている。
There are many people at the bus stop; everyone is standing still waiting.
彼はその言葉にハッとして立ち止まった。
He was startled by the words and came to a stop.
景色がきれいで観光客があちこちで立ち止まって写真を撮っていた。
The scenery was beautiful and tourists stopped here and there to take photos.