noun
EXAMPLES FROM CORPUS
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At school they had once heard of some animal which had become extinct because of its huge flat feet .
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Carla Sloane was out on the lane, her huge flat feet surrounded by cases, umbrella and bags.
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Fagg fitted in: his eyesight was very poor and he had flat feet .
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He strutted about the office on his flat feet and smiled too much.
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I thought your flat feet were firmly on the ground and your grubby little fingers always ready to grab the golden egg.