think all one's Christmases have come at once

informal

(informal) To be delighted with one's good fortune.

Japanese Meaning

自分に幸運が一度に訪れたと感じ、非常に喜ぶこと。 / 予想外の嬉しい出来事が重なり、驚きとともに幸せを感じる状態。

志望したすべての大学に合格したとき、彼はまるで一度にすべての幸運が訪れたかのように嬉しくて仕方がなかった。

Sense（1）

(informal) To be delighted with one's good fortune.

thinks all one's Christmases have come at once

（ present singular third-person ）

thinking all one's Christmases have come at once

（ participle present ）

thought all one's Christmases have come at once

（ participle past ）

thought all one's Christmases have come at once

（ past ）