Handbooking

rhubarb , n :
Any plant of the genus Rheum, especially Rheum rharbarbarum, having large leaves and long green or reddish acidic leafstalks that are edible, in particular when cooked (although the leaves are mildly poisonous). (often attributive) The leafstalks of common rhubarb or garden rhubarb (usually known as Rheum × hybridum), which are long, fleshy, often pale red, and with a tart taste, used as a food ingredient; they are frequently stewed with sugar and made into jam or used in crumbles, pies, etc. […] (Britain, military, historical) A Royal Air Force World War II code name for operations by aircraft (fighters and fighter-bombers) involving low-level flight to seek opportunistic targets. […] (originally theater, uncountable) General background noise caused by several simultaneous indecipherable conversations, which is created in films, stage plays, etc., by actors repeating the word rhubarb; hence, such noise in other settings; rhubarb rhubarb, rhubarb rhubarb rhubarb. (US, originally baseball, countable) An excited, angry exchange of words, especially at a sporting event. (US, originally baseball, by extension, countable) A brawl. American sports commentator Red Barber, who popularized the baseball senses of the word, died on this day 25 years ago in 1992.

Source http://handbookblogger.blogspot.com/2017/10/rhubarb-word-of-day-for-october-22-2017.html