Phrasal Verbs and Particles in Title Case
Short words such as “up,” “out,” and “on” can change capitalization when their grammatical role changes. Chicago’s own examples capitalize “Up” or “Out” when those words function adverbially in a phrasal verb, while ordinary prepositional uses can remain lowercase.
A short particle is not automatically lowercase. In Chicago-style title case, “up” is capitalized when it functions as an adverb, and “out” can be capitalized as part of a phrasal verb such as “Getting Out,” while a true preposition such as “of” remains lowercase. Grammar determines the result.
Key details
Important caveats
Converter Boundary
This is a principal blocker for the Chicago converter because a browser-only word list cannot safely infer every part of speech from spelling alone.
Further guidance
Out Example
Chicago revised its own analysis of “Getting Out of Saigon”: “out” is better treated as part of the phrasal verb “getting out” and capitalized, while “of” remains a preposition.
Part Of Speech Rule
The same spelling can be a preposition, adverb, particle, adjective, or another category in different constructions. Surface word length alone is not enough for reliable automation.
Practical Application
Classify the short word by grammatical function before applying title case. In Chicago-style examples, particles/adverbs in phrasal verbs such as “Up” or “Out” can be capitalized even though the same spelling may be lowercase when it is a true preposition.
Reader Check
Is the short word part of the verb’s meaning (a particle/adverb), or is it introducing a prepositional object? If the grammar is unresolved, do not force a fixed lowercase-list result.
Up Example
Chicago explains that “up” in “It’s Up to You” is an adverb and is therefore capitalized under its title-case rules.
Worked Example
Compare a phrasal-verb use such as “Setting Up the Account,” where “Up” belongs to the verb, with a genuine prepositional use governed by the selected style’s preposition rule.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- Headlines and Titles of Works — “up” as an adverb in a title (opens in a new tab)The Chicago Manual of Style / University of Chicago Press · Chicago treatment of “up” when it functions adverbially
- Headlines and Titles of Works — “out of” and phrasal-verb parsing (opens in a new tab)The Chicago Manual of Style / University of Chicago Press · Chicago parsing of “out” as an adverbial particle versus a preposition