a stout string, rope, etc., strung through the gills and mouth of newly caught fish, so that they may be carried or put back in the water to keep them alive or fresh.
8.
a contestant, player, or other person ranked according to skill or accomplishment (used in combination):
Most of the conductors at the opera house were third-stringers.
(nautical) a longitudinal structural brace for strengthening the hull of a vessel
3.
a journalist retained by a newspaper or news service on a part-time basis to cover a particular town or area
Word Origin and History for stringer
n.
"newspaper correspondent paid by length of copy," 1950, probably from earlier figurative sense of "one who strings words together" (1774); agent noun from string (v.).