giggle to laugh in a nervous or excited way, especially at something silly咯咯地笑；傻笑：Andy and Sarah were giggling helplessly at the back of the class. 安迪和薩拉在教室後面咯咯地笑成一團。
chuckle to laugh quietly, especially in a private or secret way 低聲輕笑：”Now that was a sight to see!” chuckled Anne as she looked at the photos. 安妮一遍看著照片一邊輕聲笑道，“瞧，這多可笑呀！”
cackle to laugh in a loud unpleasant way especially when you are taking pleasure in someone else’s bad luck （尤指幸災樂禍地）高聲大笑：The old man was cackling horribly and rubbing his hands.老頭獰笑著，不停地抓撓自己的手。
snigger to laugh secretly and quietly, especially in an unkind way or at something that is rude （尤指刻薄地）暗笑，竊笑：The children started sniggering at Judy’s dancing .看著朱迪跳舞，孩子們開始竊笑。
titter to laugh quietly and unkindly when something embarrassing happens（在尷尬發生時）竊笑，哧哧地笑：The audience tittered as Brock fell through the door. 布羅克穿過門口時摔了一跤，觀眾們竊笑起來。
Get the giggle to start giggling and be unable to stop開始咯咯地笑個不停：We got the giggles in the middle of the ceremony and Sarah was furious. 典禮舉行到一半時我們開始咯咯地笑個沒完，薩拉為此大為光火。
be in hysterics/stitches to laugh in an excited and uncontrolled way狂笑不止；捧腹大笑：You should have seen his face—we were in absolute hysterics! 你當時該看看他的表情，我們個個笑得前仰後合！
crack up(informal 【非正式】)to suddenly start laughing at something, often in a situation when you are not supposed to （常指在不適宜的場合）突然開始大笑起來：When he told us to leave the room, we just cracked up, I’m afraid. 他叫我們離開房間時，我們卻突然大笑起來。
