を合わせる

to adjust or align something to match; to bring things together

→ を
phrase Uncommon #13,384
to adjust or align something to match; to bring things together The exact meaning depends on what comes before を. It can refer to matching schedules or settings, coordinating, or combining efforts.
JA: 私がそちらにスケジュールを合わせるよ。
EN: I’ll adjust my schedule to yours.

台本に俳優じゃなくて俳優に台本を合わせるんだ

You adapt the script to the actors, not the actors to the script.

— ラ・ラ・ランド (2016)

そいつと何かを合わせるなら…白ワインがいいね。

If you're pairing it with something, white wine would be good.

— アトランティス 失われた帝国 (2001)

この服にはどんなアクセサリーを合わせるつもり?

What accessories are you planning to pair with this outfit?