The pyrrhic - two consecutive unstressed syllables standing in place of a normal foot - is the most contested unit in English prosody. Some handbooks defend it as a real foot; others argue that in read speech one of the two syllables always absorbs some prominence, making a true double-slack foot impossible.
What everyone agrees on: pyrrhic substitutions occur mid-line, especially paired with a neighboring spondee, letting the line breathe between heavy beats. They appear most often in loose iambic verse of the nineteenth and twentieth centuries.
For students, the practical takeaway is diagnostic: if your scan shows ˘ ˘ where an iamb should be, ask whether the poet wanted a hush there, or whether a lightly stressed word deserves more weight than the dictionary suggests. That judgment call is exactly why our tool lets you toggle every syllable rather than dictating a single answer.
Explore pyrrhic substitutions across a whole poem with the Scansion Checker, then correct individual readings interactively in the Poetry Meter Checker.