This is the 1119th most frequent Japanese word.
させ
"させ" is a causative auxiliary verb meaning "make (someone do)" or "let (someone do)."
Indicates that the action of thinking was caused or made to happen by the speaker to the subject.
私は彼にそれを考えさせました。
I made him think about it.
Denotes permission or causing an action to happen.
彼女は歌を歌わせました。
She let (or made) someone sing a song.
Represents allowing someone to perform an action.