~くする (make [adjective])

Manjiro played a role in bringing these two countries closer together.

The mother rabbit is keeping her babies warm with her body.

She blushes the moment she's around him.

She watched the movie crying, with her eyes red from tears.

She pounded the hamburger meat flat.

Being polite pays off.

She seems to have taken offense at his words.

She was hurt by what he said.

She looks cute with her hair cut short.

She had warmed up the dining room for winter.

My father made the family living room bigger.

She turned down the radio.