lambast

The verb 'lambast' is an etymological puzzle with two plausible origins that may have influenced each other. The first part, 'lam', likely comes from a Scandinavian source meaning 'to beat' (related to the English dialect word 'lam'). The second part, 'bast', could derive from the Old Norse word 'basta' meaning 'to thrash' or, alternatively, be a figurative use of 'baste' meaning 'to sew loosely' or 'to moisten meat while cooking', implying a repeated, punishing action. Over time, the literal sense of physical beating evolved entirely into the modern figurative meaning of a harsh verbal or written attack. This shift from physical to verbal punishment is a common path of semantic evolution in English.

The word is a simplex. Its spelling and form do not allow for a transparent segmentation into meaningful, reusable English morphemes derived directly from its current spelling.