the.com/waterline

The line that decides whether you're sailing or swimming.

means The line on a ship's hull where the surface of the water sits, marking the boundary between the part that floats above and the part submerged below.

from A plain compound of "water" and "line," both Old English at heart — "water" (wæter) and "line" (line, from Latin linea, a flaxen thread or cord). Sailors needed a word for that crucial mark, and English did what it loves best: bolted two ordinary words together into one useful one. It later floated outward into figurative speech, where keeping something "above the waterline" means keeping it safely afloat.

Plimsoll mark
Cargo ships carry a legal load-limit line by law
Below it
Hull paint resists barnacles, weeds, and slime
Salt vs fresh
Ships ride higher in salty seas
Combat term
A hit below the waterline sinks fastest
Eyeliner trick
Makeup's waterline is your inner eyelid rim
for instance

plimsoll line — international maritime mark on ships' hulls showing maximum safe loading depth, established 1876

titanic wreck waterline — the iceberg damage occurred below the waterline at 11:40 pm on april 14, 1912

panama canal waterline — ships transit between atlantic and pacific through gatun lake at 85 feet above sea level

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