(less common) Synonym of bite off more than one can chew

(anatomy) An abnormal extra or accessory conduction pathway between the atria and ventricles.

plural of bundle of Kent

(medicine, informal) When diagnosing a patient's symptoms, common ailments should be considered as more probable than rare ones.

plural of lake of Wada

(mathematics) Any of three disjoint connected open sets of the plane or open unit square with the counterintuitive property that they all have the same boundary.

(vulgar, slang) Something worthless. / An emoji in the shape of a coiled pile of feces with a smiling face (💩).

(idiomatic, informal) The top end of town.

(idiomatic, informal) The affluent part of a community.

Those who drudge, or are made to work hard; those who do menial or servile work at the behest of others; physical labourers.