noun
a person's manner of walking or moving on foot
verb
to step or walk on or over something
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It is considered disrespectful to tread upon the sacred ground of the temple.
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Hey, watch where you're going! You almost tread upon my foot.
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I dare you to tread upon that guy's turf, see what happens.
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She felt like she was treading upon dangerous territory when discussing politics with her in-laws.