'airer' originates from the English word 'air,' specifically the verb 'to air,' where 'air' meant 'to expose to the air for drying or freshening.'

'air' transformed into the noun 'airer' to describe a tool or person that performs the action of airing.

Initially, it meant 'to expose to air,' but over time it evolved into its current meaning of 'a tool or person that airs something.'