/-fʊl; -,ful/
n
1 [C] as much as can easily be put into the mouth at one time 一口（的量）
*eat a few mouthfuls of food 吃几口食物
* swallow sth in a/one mouthful 一口吞下某物.
2 [sing] (infml joc 口, 谑) word or phrase that is too long or difficult to pronounce 长或拗口的词语
*Timothy Thistlethwaite? That's a bit of a mouthful! 蒂莫西·西斯尔思韦特? 真有点绕嘴!

n[C]
an amount of food or drink that you put into your mouth at one time
　Michael told his story between mouthfuls.
mouthful of
　Betty drank a mouthful of beer.
　He took a mouthful of his pudding.
(a bit of) a mouthfulinformal
a long word or phrase that is difficult to say
　Her real name is a bit of a mouthful, so we just call her Dee.
give sb a mouthful
informal especially BrE to speak angrily to someone, often swearing at them
say a mouthful
AmE informal to say a lot of true and important things about something in a few words