The word 'tub' entered English in the late Middle English period, borrowed from the Low German languages where 'tubbe' denoted a small cask or barrel. While its ultimate pre-Germanic roots are obscure, it belongs to a family of words for vessels and containers. Over centuries, its meaning generalized from a specific type of cask to any wide, open container, particularly one used for holding liquids, bathing, or growing plants. The word's short, blunt phonetic form aptly reflects its simple, functional object.

The word 'tub' is a simplex word of Middle English origin, likely from Middle Dutch or Middle Low German 'tubbe', meaning a small cask or vessel. Its ultimate origin is uncertain but may be related to a Germanic base meaning 'hollow vessel'.