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1. A word or group of words difficult to articulate rapidly, usually because of a succession of similar consonantal sounds, as in Shall she sell seashells?
2. Something difficult to pronounce.
a sentence or phrase that is difficult to articulate clearly and quickly, such as Peter Piper picked a peck of pickled pepper
a word or sequence of words difficult to pronounce, esp. rapidly, because of alliteration or a slight variation of consonant sounds, as “She sells seashells by the seashore.”