Today’s word of the day is rux, meaning “to bother; fret; work (oneself) up.” Origin unknown but perhaps related to ruction, “a vexation or annoyance; also, a disturbance; a row or rumpus,” ruckus, “a disturbance; a commotion,” or one meaning of ruck: “a crowd or throng; especially, a closely packed and indiscriminate crowd or mass of persons or things; a jam; a press,” also known as a loose scrum in rugby.