Catch, noun
Oxford English Dictionary 1989
2a. The catching of fish
b. The number of fish caught at one time, or during one season. 1465
d. A stretch of water in which fish may be caught.
6. A trick. Obs. 1430
7a. A catching or entangling question. Obs. 1674
c. Catch 22 … a set of circumstances in which one requirement etc., is dependent upon another, which is, in turn dependent upon the first. Joseph Heller, Catch-22. A novel 1961.
10. concr. That by which anything is caught and held; any contrivance for checking the motion of a piece of mechanism, a door, etc. 1420
Webster’s New Collegiate Dictionary 1975
3. Something that checks or holds immoveable.
7. A concealed difficulty