英语词源字典 - 在线词源网站

bearings (n.)[bearings 词源字典]: "parts of a machine which 'bear' the friction," 1791, from present participle of bear (v.). Meaning "direction from a point of reference" is from 1630s; to take (one's) bearings is from 1711.[bearings etymology, bearings origin, 英语词源]
heart-strings (n.): also heartstrings, late 15c., in old anatomy, "the tendons and nerves that brace the heart;" from heart (n.) + string (n.). Transferred and figurative sense "strongest affections, most intense feelings" is from 1590s.
moorings (n.): 1744, "ropes, etc., by which a floating thing is made fast," from mooring. Figurative sense is from 1851.
ringside (n.): also ring-side, 1855, from ring (n.1) in the "space for fighting" sense + side (n.).