The term 'square-cut' is a transparent English compound, formed by directly combining two native elements. 'Square' traces back to Latin quadrus, meaning 'square', which itself derives from the Proto-Indo-European root kʷetwer-, meaning 'four', referencing the four equal sides and angles. 'Cut' originates from the Old English verb cyttan, related to the act of dividing or shaping by incision. The compound logically describes an object, most famously a gem, that has been shaped or 'cut' into the form of a 'square'. Its application expanded metaphorically to describe similarly angular and broad human features, such as shoulders or a jawline.

Structure: square (shape) + cut (action/result) - square: From Old French esquare, based on Latin exquadra (to square), from quadrus (square). In this compound, it functions as a noun denoting a specific geometric shape. - cut: From Old English cyttan, of Germanic origin. In this compound, it functions as a past participle/adjective derived from the verb, indicating the action performed or the resulting form.