adjective
an adjective is a word that describes or modifies a noun or pronoun. In this case, 'tottering' describes something that is unsteady or about to collapse.
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The old man was tottering as he made his way down the street.
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She was tottering in her high heels after a long night of dancing.
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The drunk guy was tottering all over the place.
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The company's finances were tottering on the brink of collapse.