Real Dictionary

dead end
A dead end job or course of action is one that you think is bad because it does not lead to further developments or progress.
countable noun: If a street is a dead end, there is no way out at one end of it.

dead end in American English
an end of a street, alley, etc. that has no regular exit
noun: something, as a street or water pipe, that has no exit

dead end in British English
noun
verb: to come to a dead end

dead-end
boring and unlikely to lead to anything more interesting or successful

dead-end in American English
having only one exit or outlet
adjective: terminating in a dead end
intransitive verb: to come to a dead end

dead-end in British English
to come to a dead end