プログレッシブ和英中辞典(第4版)の解説
ごちそう【御×馳走】
〔もてなし〕an entertainment；〔饗宴〕a dinner, a feast
ごちそうする entertain ((a person))
兄がおすしをごちそうしてくれた
My brother treated me to sushi.
山海の珍味をごちそうになった
I was entertained with all sorts of delicacies.
わー，今夜はごちそうだ
Wow, it looks like a 「great dinner [feast] tonight!
ごちそうさま
I have enjoyed the dinner very much.／Thank you for your entertainment [kind hospitality].／〔のろけられた時〕Thanks for all that talk about how wonderful he [she] is!
すばらしいごちそうでした
It was a real feast [treat].
今日は僕にごちそうさせてくれ
Let me take care of this today.
孫の顔を見るのが何よりのごちそうだ
It is a wonderful treat for me to see my grandchild.