A tongue-twister is a phrase that is designed to be difficult to articulate properly. Tongue-twisters may rely on similar but distinct phonemes (e.g., s [s] and sh [ʃ]), unfamiliar constructs in loanword, or other features of a language.

The hardest tongue-twister in the English Language (according to Genius World records) is “The sixth sick sheikh’s sixth sheep’s sick.”

Here is an example of Tongue Twister:

How much wood would a wood chuck chucked
if a wood chuck could chuck wood?
He would chuck, he would, as much wood as he could,
and chuck as much wood as a wood chuck would chuck
if a wood chuck could chuck wood.


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