Where does “sea forty legs” come from?

sea forty legs (English) comes from English forty legs, from English forty, from English Y, from English yuri, from Japanese 百合, from Japanese 連用形, from Japanese 見る, from Japanese 夢.

sea forty legs (English): A sea centipede

Definitions

  1. A sea centipede

Ancestry of “sea forty legs”, step by step

sea forty legs traces back through two separate lines of ancestry.

via English forty legs

StepLanguageWordMeaning
1Englishforty legsA centipede
2EnglishfortyThe cardinal number occurring after thirty-nine...
3EnglishYA figure or mark in the shape of the letter Y; A...
4EnglishyuriA narrative or visual work featuring a romance or...
5Japanese百合lily
6Japanese連用形an inflectional category: the continuative or...
7Japanese見るto see, to watch, to observe, to look at...
8Japanesea dream; a vision; leaving reality to the state...
9Old Japanesea dream
10Japanesean order in biology: smaller than a class, bigger...
11Middle Chinese

via English sea

StepLanguageWordMeaning
1EnglishseaA large body of salt water; A lake, especially if...
2Middle Englishseesea, ocean; A body of water, a lake; seat, chair
3Old Englishsea, lake
4Proto-West Germanicsaiwisea
5Proto-Germanicsaiwizsea, ocean
6Proto-Germanicsīhwanąto filter
7Proto-Indo-Europeanseykʷ-to moisten; to filter
8Proto-Indo-Europeansey-to be wet; dribble; run; to stretch one's arm;...
Every word from Middle Chinese