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1. Be a substitute
   "The young teacher had to stand in for the sick colleague";
   - substitute, sub, fill in

1. Someone who takes the place of another (as when things get dangerous or difficult)
   "the star had a stand-in for dangerous scenes";
   - substitute, relief, reliever, backup, backup man, fill-in

Derived forms: stood in, standing in, stands in, stand-ins

Type of: change, compeer, equal, exchange, interchange, match, peer

Encyclopedia: Stand in