N-SING
冗长而拗口的词（或短语）;难读的词（或短语）
If you describe a long word or phrase as a mouthful, you mean that it is difficult to say.
例句
It's called the Pan-Carib-bean Disaster Preparedness and Prevention Project, which is quite a mouthful.
它被称为 the Pan-Caribbean Disaster Preparedness and Prevention Project（泛加勒比备灾防灾项目），名称相当冗长拗口。