Much of language does not 'make sense'. It is a matter of what is accepted and understood by its speakers. These are the number of examples found in Google Books: Extend the deadline - 1192 Postpone the deadline - 118 Delay the deadline - 0
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AnonymousDoes this mean that an expression becomes correct because lots of people use it or it appears in many places?Eventually; it is just a matter of time.
AnonymousDoes that mean "ain't" is correct English?It is correct and common casual English only.