(2channel slang, Internet slang) exclusively lurking

(colloquial) Contraction of 見ている (miteiru).

所見: (Classical Japanese, archaic) to be seen, be found

prying eyes; people who may be watching / the quality of being perceptive, observant / appearance, look

butterfly valve

a sphenoid bone

a brush-footed butterfly

(card games) in 花合わせ (hana-awase, “games played with hanafuda cards”), a 出来役 (dekiyaku, “meld”) of the boar, deer, and butterfly cards; worth five points in こいこい (koi-koi)

The bethrothed are to tie the knot. The newlyweds' fingers are bound together by a red rope, symbolizing that their destinies are now bound forever.

(dated) red wine