Quick Answer
Why "Up" Is Complicated
"Up" is genuinely one of the trickiest words in English title case because its function changes depending on context. Most words have a stable part of speech – "with" is always a preposition, "very" is always an adverb. But "up" shifts roles frequently, and different style guides handle this shift differently.
As a preposition, "up" shows direction or position: "walk up the stairs," "up the street," "climb up the mountain." In this role, "up" is lowercase in every major style guide because it's only three letters and prepositions are typically short words.
As an adverb, "up" modifies a verb and adds meaning: "give up," "set up," "break up." In these phrasal verb constructions, "up" is part of the verbal action, not just a directional marker. AP and Chicago capitalize adverbs, so "up" becomes "Up" in titles: "Give Up Hope," "Set Up Your Account." APA and MLA sidestep this complexity entirely by using a simple rule: "up" has three letters, so it's lowercase regardless of part of speech.
By Style Guide
| Style Guide | “up” in middle of title? | Rule |
|---|---|---|
| AP | Lowercase | Lowercase as preposition (3 letters); capitalize as adverb/adjective in phrasal verbs |
| APA | Lowercase | Lowercase words of three or fewer letters regardless of part of speech |
| Chicago | Lowercase | Lowercase as preposition (3 letters); capitalize as adverb/adjective in phrasal verbs |
| MLA | Lowercase | Lowercase words of three or fewer letters regardless of part of speech |
The single biggest factor in whether to capitalize "up" is understanding its grammatical role. As a preposition (showing direction): lowercase in all styles. As an adverb in a phrasal verb ("give up," "set up," "break up"): capitalize in AP/Chicago, lowercase in APA/MLA. As an adjective ("the up side"): capitalize in AP/Chicago, lowercase in APA/MLA. If you're unsure whether "up" is a preposition or something else, ask: "Is 'up' showing direction?" If yes, it's a preposition – lowercase. "Is 'up' part of a verb phrase that changes the verb's meaning?" If yes, it's likely an adverb – capitalize in AP/Chicago, lowercase in APA/MLA.
Examples
✓ Do
- Give Up Hope
- Set Up Your Account
- Break Up Songs
- Walk up the Mountain
✗ Do not
Walk Up the Mountain
Treating 'up' as more important than it is when used as a preposition
The UP Side
All-caps — never correct in any style guide
APA/MLA style (always lowercase for 3-letter words)
- Give up hope
- Set up your account
- Break up songs
Edge Cases
A few situations where the standard rules shift:
- "Up" as the first word of a title. Capitalize "up" when it starts a title, regardless of style guide or part of speech. "Up in the Air" — ✓ (all styles). "Up the Ladder" — ✓ (all styles).
- "Up" as the last word of a title. Most guides capitalize the last word of a title. Capitalize "up" at the end in all styles. "Why We Give Up" — ✓ (all styles).
- "Up" after a colon. The word after a colon is treated as the start of a new title segment. Capitalize "up" after a colon in all styles.
- Phrasal verbs vs. prepositions – context is critical. "Look up the street" (preposition – "up" = direction) versus "Look Up the Number" (phrasal verb – "up" = to find). In the first, "up" is lowercase in all styles. In the second, "up" is capitalized in AP/Chicago, lowercase in APA/MLA.
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About Oleh Kovalenko
Oleh Kovalenko develops practical capitalization guidance for editorial and SEO workflows, with a focus on consistent rule application.
