in the throes of

Prepositional phrase

Heavily occupied, or busily involved in an important activity.

Japanese Meaning

重要な活動に没頭している状態 / 重大な事柄に邁進している状態

She found herself in the throes of organizing the charity gala, juggling sponsors, volunteers, and last-minute logistics.

彼女はチャリティーガラの準備に没頭しており、スポンサーやボランティア、直前の細かい手配を同時にこなしていた。

Sense（1）

Heavily occupied, or busily involved in an important activity.

We won't be able to meet next week as we will be in the throes of moving offices. Perhaps the week after will be better.