プログレッシブ和英中辞典(第4版)の解説
まさか
まさか君がやったのではないだろうね
Surely you didn't do it, did you?／Don't tell me you did it!
まさか本人に向かってばかだとも言えやしないしね
I can't possibly tell him to his face that he's a fool, can I?
まさか一等になるとは思わなかった
I (had) never dreamed that I might win (the) first prize.
「僕が殴ったのです」「まさか」
“I hit him.”“ 「You can't mean it! [You didn't!]”
まさかの時
まさかの時には伯父の所へ行け
Go to your uncle in time of need.
まさかの時の備えは出来ている
I am prepared [ready] for 「whatever may happen [any emergency].