not able to move or be moved; fixed in one place and unable to change position.
From Latin 'immobilis,' combining 'im-' (not) and 'mobilis' (moveable, from 'movere' meaning 'to move'). The term has been used in English since the 14th century in both literal and figurative senses.
In physics, Newton's First Law says an object at rest stays at rest unless acted upon—which is basically why immobile things stay immobile! But in biology, playing dead and staying immobile is actually a survival strategy many animals use.
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