Mechanical devices that move fluids by pressure or suction, or low-cut shoes without fastenings.
From Middle English 'pumpe', possibly from Dutch 'pompe'. The shoe sense emerged in the 16th century, likely from the resemblance of the shoe's shape to certain pump mechanisms.
It's remarkable that the same word describes both hydraulic machinery and elegant footwear - both involve precise engineering and the management of pressure, whether water pressure or the pressure of supporting a human foot gracefully.
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