on cue

US /ɑn kjuː/
UK /ɑn kjuː/
"on cue" picture
1.

ちょうどその時, 期待通りに

if something happens on cue, it happens just after someone has said or thought that it would happen

:
As soon as I mentioned his name, he walked on cue into the room.
彼の名前を口にした途端、彼はちょうどその時部屋に入ってきた。
The rain started on cue, just as we were about to leave.
私たちがちょうど出発しようとしたとき、雨がちょうどその時降り始めた。