“咧嘴笑”的英语可以翻译为：grin ...

他总是这样傻傻地咧嘴笑。He always had this inane grin.他一本正经地咧嘴笑了笑。He showed his teeth in a humourless grin.弗里达咧嘴笑了，捏了捏他的屁股。Frieda grinned, pinching him on the butt....