In Greek

Ancient Greek literature

Ancient Greek literature refers to literature written in the Ancient Greek language until the 4th century.- Classical and Pre-Classical Antiquity :...

 and Latin poetry

Latin literature

Latin literature includes the essays, histories, poems, plays, and other writings of the ancient Romans. In many ways, it seems to be a continuation of Greek literature, using many of the same forms...

, a choriamb is a metron (prosodic foot)

Foot (prosody)

The foot is the basic metrical unit that generates a line of verse in most Western traditions of poetry, including English accentual-syllabic verse and the quantitative meter of classical ancient Greek and Latin poetry. The unit is composed of syllables, the number of which is limited, with a few...

 consisting of four syllable

Syllable

A syllable is a unit of organization for a sequence of speech sounds. For example, the word water is composed of two syllables: wa and ter. A syllable is typically made up of a syllable nucleus with optional initial and final margins .Syllables are often considered the phonological "building...

s in the pattern long-short-short-long (— ^{‿ ‿} —), that is, a trochee

Trochee

A trochee or choree, choreus, is a metrical foot used in formal poetry consisting of a stressed syllable followed by an unstressed one...

 alternating with an iamb. Choriambs are one of the two basic metra that do not occur in spoken verse, as distinguished from true lyric or sung verse. The choriamb is sometimes regarded as the "nucleus" of Aeolic verse

Aeolic verse

Aeolic verse is a classification of Ancient Greek lyric poetry referring to the distinct verse forms characteristic of the two great poets of Archaic Lesbos, Sappho and Alcaeus, who composed in their native Aeolic dialect...

, because the pattern long-short-short-long pattern occurs, but to label this a "choriamb" is potentially misleading.

In the prosody of English

English language

English is a West Germanic language that arose in the Anglo-Saxon kingdoms of England and spread into what was to become south-east Scotland under the influence of the Anglian medieval kingdom of Northumbria...

 and other modern European languages, "choriamb" is sometimes used to describe four-syllable sequence of the pattern stressed-unstressed-unstressed-stressed (again, a trochee followed by an iamb): for example, "over the hill", "under the bridge", and "what a mistake!".

English prosody

In English, the choriamb is often found in the first four syllables of iambic pentameter verses, as here in Keats' Ode to Autumn:

Who hath not seen thee oft amid thy store?

Sometimes whoever seeks abroad may find

Thee sitting careless on a granary floor,

Thy hair soft-lifted by the winnowing wind;

Or on a half-reap'd furrow sound asleep,

Drows'd with the fume of poppies, while thy hook

Spares the next swath and all its twined flowers:

And sometimes like a gleaner thou dost keep

Steady thy laden head across a brook;

Or by a cider-press, with patient look,

Thou watchest the last oozings hours by hours.