ˈbrəkˌsizəm noun
( -s )
Etymology: irregular (Greek υ & χ being transliterated respectively as u & x instead of y & ch ) from Greek brychein to gnash the teeth + English -ism; akin to Old Irish brōn trouble, Welsh brwyn stabbing pain, Lithuanian gráužti to gnaw, Old Slavic grysti
: the habit of unconsciously gritting or grinding the teeth especially in situations of stress or during sleep