Peter tried to walk on water is a metaphor for buoyancy and density.

2 months ago
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Peter
masc. proper name, 12c., from Old English Petrus (genitive Pet(e)res, dative Pet(e)re), from Latin Petrus, from Greek Petros, literally "stone, rock" (see petrous)
petrous (adj.)
c. 1400, in anatomy, "very hard, dense,"

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