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plural tumblehomes
(nautical) The inward curve of the topsides of some ship hulls. quotations examples
The bodysides have a gentle tumblehome, which gives the machine impressive solidarity of appearance, well set off by the new B.R. standard livery of light-skirted green.
1961 August, “The English Electric Type 5 3,300 h.p. "Deltic" diesels for British Railways”, in Trains Illustrated, page 468