A frown creased her forehead.

她一皱眉，额头显出了皱纹。

《牛津词典》

His forehead knotted in a frown.

他的眉头紧皱。

《柯林斯英汉双解大词典》

His forehead was bunched in a frown.

他皱紧眉头。

《牛津词典》

Milton ultimately is a pious man and wants us to frown on Satan's critique of the Judeo-Christian conception of divinity.

弥尔顿终究还是个虔诚的教徒，想要我们厌恶撒旦,对犹太教与基督教共有的神权概念的批判。

耶鲁公开课 - 弥尔顿课程节选

It takes a blank look and actually makes it look like a frown, and it takes a smile and makes it appear neutral.

FORBES: Smile For The Camera -Media Training

Without any further explanation, the first group was asked to form of a smile, while the second was told to wear a frown.

FORBES: Ten Ways To Ease Painful Mood Swings Without Taking Pills

This week, Grumpy Cat is coming to New York to promote the forthcoming Chronicle Books release, "Grumpy Cat: A Grumpy Book: Disgruntled Tips and Activities Designed to Put a Frown on Your Face" at BookExpo America, the publishing industry convention.

WSJ: Grumpy Cat Has an Agent, and Now a Movie Deal