Englishfor English speakers
an
Determinative
—
An (or a) is used when the following word could be any of a certain type.
I just ate an apple.
It is indeed an honor to have met you today.
den
Noun
—
A den is a place where a wild animal lives.
The wolf went back to his den to sleep after a day of hunting.
—
A den is a small cave in the side of a hill.
Brexit
properNoun
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withdrawal of the United Kingdom from the EU
Brexit
verb
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(of Britain) To exit the European Union.
—
(slang, by extension) To leave a romantic relationship.