Second string and Second-fiddle

Second string noun - A squad of players that are available either individually or as a team to relieve or replace the players who started the game.

Second-fiddle and second string are semantically related In some cases you can use "Second-fiddle" instead an adjective phrase "Second string".

Second string and second-fiddle are semantically related in secondary role player topic. Sometimes you can use "Second string" instead a noun phrase "Second-fiddle".