Source: https://en.wikipedia.org/wiki/Knurling
Sick passengers go below deck, which provides shelter from the weather, but just as importantly, the sway is not as great below deck (low on the ship).
“Much” comes from Proto-Germanic “mikilaz”, while “mucho” from Latin “multum”. Their similar appearance is a complete coincidence.
Source: https://en.wikipedia.org/wiki/Cognate#False_cognates
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