嚎啕大哭；痛哭流涕
cry buckets
I cry buckets every time I watch this drama.
　
辗转反侧；坐立不安
twist and turn
I was in the hope that I had a good night's sleep but instead twisted and turned all night long because I was worried about my job.
　
胆小如鼠；不敢得罪人
would/could/will not say boo to a goose
His wife used to say he would not say boo to a goose.
　
胆大包天；胆大妄为；厚颜无耻
(as) bold as brass
No one had invited her to the wedding, but she showed up at the church, bold as brass.
　
聪明伶俐
(as) bright as a button

My little son's as bright as a button.