'cot' originates from Old English, specifically the word 'cot' or 'cote', where it meant 'small hut' or 'shelter'.

'cot' changed from Old English 'cot' (and related Old Norse 'kot') meaning a small dwelling or hut into Middle English 'cot', and later acquired senses referring to small beds or temporary sleeping places.

Initially, it meant 'small shelter or hut', but over time it evolved into its current meanings of 'a small/simple bed' and (in British English) 'a baby's crib'.