待たせる

Omatase shite mōshiwake arimasen.

I am very sorry to have kept you waiting.

Osoku natte gomen, nagaku matasechatta ne.

Sorry I'm late, I kept you waiting for a long time, didn't I?

Kanojo o kore ijō mataseru wake ni wa ikanai.

I cannot afford to keep her waiting any longer.

Yakusoku no jikan ni okureta kare ni, ichijikan mo matasareta.

I was kept waiting for as long as an hour by him, who was late for our appointment.

Okyakusama o robī de omatase suru no wa shitsurei desu.

It is rude to keep guests waiting in the lobby.

Hito o mataseru toki wa, jizen ni renraku o ireru beki da.

When you are going to keep someone waiting, you should contact them in advance.