を立てて

stand or set something upright

→ を
phrase Rare #43,382
stand or set something upright Used after the thing being put upright; 立てて links this action to what follows.
JA: 私は親指を立てて合図しました。
EN: I gave the signal by raising my thumb.

時間があったらもっと豪勢にできたんだがろうそくを立てて

If I’d had more time, I could have made it more elaborate, with candles and everything.

— ザ・マン・フロム・アース (2007)

もっと高く柱を立てて針金で固定しないと無理だ

It won’t work unless you put the poles up higher and secure them with wire.

— 雪山の絆 (2023)

彼は指を立てて抗議の意を示した。

He raised a finger to show his protest.

私は親指を立てて合図しました。

I gave a thumbs-up as a signal.