think better of somebody

think (the) better of (one)

To have an improved opinion of someone; to hold someone in higher regard or esteem than previously. Your boss will think better of you if you stand up for yourself. I don't really care whether they think the better of us or not—we're doing this because it's the right thing to do.
See also: better, of, think

think (the) ˈbetter of somebody

have a higher opinion of somebody: She has behaved appallingly — I must say I thought better of her.
See also: better, of, somebody, think