(originally US, informal) An ordinary person who works in a non-management position, especially one who works for wages rather than a salary.

Maintaining a stiff upper lip.

Extremely bored.

Synonym of styfziekte

(idiomatic) The quality of being resolute and showing self-restraint, stereotypically associated with the British; especially as keep a stiff upper lip.

plural of stiff-tailed duck

A duck of the Oxyurinae subfamily.

(medicine) A rare neurological disorder characterized by progressive rigidity and stiffness, primarily of the axial musculature, resulting in postural deformities.

Solidago rigida, native to most of eastern North America.

plural of stiff upper lip