A bacchius () is a metrical foot of three syllables, consisting of one unstressed syllable followed by two stressed ones.
In accentual-syllabic verse we could describe a bacchius as a foot that goes like this:
Example:
When day breaks
the fish bite
at small flies.
The Christmas carol 'No Small Wonder' by Paul Edwards is a fair example of usage.
The name is thought to come from its use in ancient Greek songs to the god Bacchus.[1]
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Preminger, Alex. The Princeton Handbook of Poetic Terms. Princeton University Press. p. 18. ISBN 0-691-01425-6.