Hyphen

Definition and stakes

Portrait of Goold Brown Goold Brown,  The Grammar of English Grammars (1882)

“ Accordingly, when a compound has but one accented syllable in pronunciation, as night'cap, bed'stead, broad'sword, the two words have coalesced completely into one, and no hyphen should be admitted. On the other hand, when each of the radical words has an accent, as Chris'tian-name', broad'-shoul'dered, I think the hyphen should be used. Good'-na'tured is a compound epithet with two accents, and therefore requires the hyphen: in good nature, good will, and similar expressions, good is used simply as an adjective, and of course should remain distinct from the noun. ”
Source: Wikisource

Portrait of Goold Brown Goold Brown,  The Grammar of English Grammars

“ OBS. 8.—No regular phrase, as I have taught in the second rule above, should be needlessly converted into a compound word, either by tacking its parts together with the hyphen, or by uniting them without a hyphen; for, in general, a phrase is one thing, and a word is an other: and they ought to be kept as distinct as possible. [113] But, when a whole phrase takes the relation of an adjective, the words must be compounded, and the hyphen becomes necessary ”
Source: Gutenberg

Grant Milnor Hyde,  Newspaper Reporting and Correspondence

“ Omit the hyphen when using an adverb compounded with -ly before a participle: a newly built house.
Use a hyphen after prefixes ending in a vowel (except bi and tri) when using them before a vowel: co-exist. When using such a prefix before a consonant do not use the hyphen except to distinguish the word from a word of the same letters but of different meaning: correspondent, but co-respondent (one called to answer a summons) ; recreation, but re-create (to create anew) reform, but re-form (to form again) ; re-enforced
”
Source: Gutenberg

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