ear-to-ear 是什么意思？

But the ear-to-ear grins are gone - replaced by blank stares, furrowed brows and an occasional flush of the face. 有谁能帮我翻译这个句子？ 谢了！

ear-to-ear在这里我觉得是形容的是笑的时候嘴角上扬。开心的以至于嘴角快接近耳根了。
这句话我理解的是：他脸上开心的笑容消失了，只是呆呆的盯着某个地方看，取而代之的是紧锁的眉头和时不时泛红的脸庞。

FYR~

1. 满面笑容 例句: 1. a woman's face is said to be most attractive when the space between her pupils is justunder half the width of her face from ear to ear. 当一个女性的两眼瞳孔间距离小于她双耳间距离的一半时，她的面孔据说是最具吸引力的。 ----------------------------------- 如有疑问欢迎追问！ 满意请点击右上方【选为满意回答】按钮