(finance) illegitimate sale of resources / (beauty, of the breasts) sagging to the side

multiple people writing messages on an item / item on which multiple people write messages

(of multiple people) to write messages on an item

writing a character with a certain person in mind

to write a character with a certain person in mind

(with と) merrily

(colloquial, vulgar) a penis, a cock, a dick / (archaic) a short person

(idiomatic) "a fish who's found water" → In one's element, a duck to water.

absorbing (knowledge) very quickly and naturally

a European water vole (Arvicola amphibius)