を思いとどまらせた

dissuaded someone from

→ を
phrase Rare #37,932
dissuaded someone from Used with を to mark the person who was dissuaded; the action they were dissuaded from is usually followed by の or こと.
JA: 友達が私をその仕事に応募するのを思いとどまらせた。
EN: My friend dissuaded me from applying for that job.

私の両親は私が一人旅するのを思いとどまらせた

My parents discouraged me from traveling alone.

になりそうだったので、私は彼が泳ぎに行くを思いとどまらせた

Since it looked like it was going to rain, I talked him out of going swimming.

彼らは彼女が長い髪を切ることを思いとどまらせた

They dissuaded her from cutting her long hair.