Backup and Second string

Backup noun - A crowded mass (as of cars) that impedes or blocks movement.

Second string and backup are semantically related. in substitute topic. In some cases you can use "Second string" instead a noun "Backup".

Nearby Word: backing

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.

Backup and second string are semantically related. Sometimes you can use "Backup" instead a noun phrase "Second string".