knuckle (n.)youdaoicibaDictYouDict
mid-14c., knokel "finger joint; any joint of the body, especially a knobby one; morbid lump or swelling;" common Germanic (cognates: Middle Low German knökel, Middle Dutch cnockel, German knöchel), literally "little bone," a diminutive of Proto-Germanic root *knuk- "bone" (compare German Knochen "bone).

As a verb from 1740, originally in the game of marbles. To knuckle down "apply oneself earnestly" is 1864 in American English, extended from marbles (putting a knuckle on the ground in assuming the hand position preliminary to shooting); to knuckle under "submit, give in" is first recorded 1740, supposedly from the former more general sense of "knuckle" and here meaning "knee," hence "to kneel." The face-busting knuckle-duster is from 1858 (a duster was a type of protective coat worn by workmen).
Mickey MouseyoudaoicibaDictYouDict
cartoon mouse character created 1928 by U.S. animator Walt Disney (1901-1966). As an adjective meaning "small and worthless" it dates from 1936, originally used especially of mediocre dance-band music, a put-down based on the type of tunes played as background in cartoon films.
principled (adj.)youdaoicibaDictYouDict
"honorable, moral," 1690s, from principle, which was used as a verb 17c.-18c. meaning "to ground in principles."
tattersall (n.)youdaoicibaDictYouDict
fabric with small and even check pattern, 1891, so called because it was similar to the traditional design of horse blankets, in reference to Tattersall's, a famous London horse market and gambler's rendezvous, founded 1766 by Richard Tattersall (1724-1795). The surname is from the place in Lincolnshire, which is said to represent "Tathere's nook," "probably in the sense 'nook of dry ground in marsh'." [Cambridge Dictionary of English Place-Names]
howffyoudaoicibaDictYouDict
"A favourite meeting place or haunt, especially a pub", Mid 16th century (as the name of the main burial ground in Dundee): of unknown origin.