To step or walk on something; as a noun, refers to the pattern on a tire or the horizontal part of a step.
From Old English 'tredan' meaning 'to step on' or 'trample', related to Old Norse 'troða'. The tire meaning developed from the idea of the surface that 'treads' on the road.
Tread connects our most basic human action - walking - with modern technology like tire design. The phrase 'tread lightly' beautifully captures both literal careful walking and metaphorical cautious behavior, while 'treading water' extends the concept to survival.
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