
(old-fashioned, set phrase) sorry to have kept you waiting; used when serving food or greeting someone
「お待ちどおさま」と丁寧に挨拶した。
I politely greeted them saying 'thank you for waiting.'
受付の人がお待ちどおさまと声をかけた。
The receptionist said 'thank you for waiting.'
店員がお待ちどおさまと言って料理を運んできた。
The waiter said 'Sorry to keep you waiting' and brought out the food.