Lockjaw

Technically known as trismus (Greek τρισμος, trismos, "a grinding"), lockjaw is a pathological condition in which the mouth is locked shut by contractions of the jaw muscles. It is commonly caused by tetanus.

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Eddie "Lockjaw" Davis was a jazz saxophonist (d. 1986).

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Locust Valley Lockjaw is an upper class American accent.