chuckle
/ˈtʃʌkl; `tʃʌkl/ v[I, Ipr]
laugh quietly or to oneself 轻声地笑; 暗自笑
He chuckled (to himself) as he read the newpaper. 他看报时暗暗（独自）发笑.
What are you chuckling about? 你独自笑什麽? =>Usage at chortle 用法见chortle. chuckle, n quiet or partly suppressed laugh 轻声的笑; 忍俊不禁
She gave a chuckle of delight. 她高兴得笑出声来.