mouthful
词根词缀：
后缀
-ful
1 表形容词，“有…的，具有…性质的，易于…的”
2 表名词，“充满时的量”
armful n. 一抱
arm 手臂 + ful 充满时的量 → 一抱
boatful n. 一船
boat 小船 + ful 充满时的量 → 一船
dishful n. 一碟
dish 盘 + ful 充满时的量 → 一碟
handful n. 一把
hand 手 + ful 充满时的量 → 一把
mouthful n. 一口
mouth 口 + ful 充满时的量 → 一口
spoonful n. 一勺
spoon 匙 + ful 充满时的量 → 一勺
数据来源：新东方英语词汇速记大全
相关例句：
He prodded at the fish with his fork a few times, but he didn't eat a mouthful.
他用叉子戳了几次鱼，但一口也没有吃。
You cannot get fat on one mouthful. He ate the cake whole.
一口吃不成一个胖子。他把整块蛋糕一口吃了。
He took a mouthful of neat whisky, and coughed.
他喝了一口纯威士忌，咳嗽了起来。
She swallowed a mouthful of the hot strong brew, and wiped her eyes.
她喝了一口热浓茶，又擦了擦眼睛。
I can not manage another mouthful.
我一口也不能再吃了。
I took only a mouthful of food and then left.
我只吃了一口饭就离开了。