Up UntilHow to use "until" correctly
Until can act as either a subordinating conjunction or a preposition. In either role it acts alone. Avoid nonstandard expressions like up until, as up contributes nothing to its meaning or function:
Up until I was twenty, I had never traveled abroad.
Until I was twenty, I had never traveled abroad.
up until the start of the match
until the start of the match
Common Errors in English Usage: Errors in diction and idiom commonly made by native speakers of English
List of Common Errors in English Usage (PDF): Printable version of the complete list
Common Grammar Errors: A list of common errors in grammar (topics like subject-verb agreement and parallelism) as distinct from usage