n.

1. 满口；一口；少量[C][（+of）]
   I took only a mouthful of food and then left.

   我只吃了一点儿东西就走了。

2. 【口】冗长而难念的字（或句）[S]
   That Russian name is really a mouthful.

   那个俄文名字真拗口。

3. 【口】重要的话；确切的话[S]

n.

1. a quantity of food or drink that fills or can be put in the mouth.
2. a long or complicated word or phrase.