Something that is a mouthful is difficult to say or pronounce or just too long to bother saying.
Example: The new hospital is going to be called the Marjorie Jackson Nelson Hospital, which is quite a mouthful
a large amount
Example: I've got a hell of a lot of work to do.
To show off something is to display it proudly.
Example: My wife showed off the baby at the office.
For more meanings of the phrasal verb show off
, follow the link.
Follow the link to find out when to spell the word principle or principal.
become uncommon and then disappear
Example: The corner shop is slowly dying out.
old people; people who have been doing something for a long time
Example: One way to revitalise the company would be to get rid of all the old timers.