を共にする

share with; share or experience something together with someone or something

→ を
phrase Rare #32,471
share with; share or experience something together with someone or something Used to express sharing something—such as an experience, life, fate, or a bed—with someone or something. The person or thing shared with is marked by と. The expression is somewhat formal or literary.
JA: 時には船長は船と運命を共にするものだ。
EN: Sometimes a captain shares the fate of the ship.

時には船長は船運命を共にするものだ

Sometimes a captain goes down with his ship.

私は紳士らしく正装して運命を共にする

I'll go down with the ship in full formal attire, like a gentleman.

— タイタニック (1997)

そうだなこれから生死を共にするだからな

Yeah, we’re going to be in this together from here on out—come hell or high water.

— スター・トレックII カーンの逆襲 (1982)

お前と冒険を共にするのはなかなか楽しい経験

Going on adventures with you is pretty fun.

— インディ・ジョーンズ/最後の聖戦 (1989)