A soft, loose indoor shoe that's easy to slip on and off, usually worn around the house for comfort.
From the verb 'slip' combined with the suffix '-er' (something that does an action). The word developed in the 1600s from the idea that you 'slip' your foot into this shoe easily, unlike laced boots.
Cinderella's iconic glass slipper is specifically called a 'slipper' because in the original fairy tales, the magical shoe was meant to fit so perfectly and slip on so easily that it could only belong to one person.
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