What happened (English meanings and origin notes for three idioms/words)
An English-usage Q&A gives meanings and usage guidance for three commonly asked expressions: “grinning like a Cheshire cat,” “Gandhi’s revenge,” and “latrinogram.” The Q&A also gives origin background for “grinning like a Cheshire cat,” and it explains how “latrinogram” is built from “latrine” and “gram.”
1) “Grinning like a Cheshire cat” — meaning and origin chain
Meaning: “Grinning like a Cheshire cat” refers to a broad, visible smile.
Origin background (as explained in the Q&A): Cheshire is a region in England. The Q&A states that Cheshire cheese was historically marked with a smiling cat face. The Q&A further states that Lewis Carroll’s “Alice in Wonderland” helped popularise the idiom, describing the Cheshire cat’s smile as the last visible feature as the cat disappears.