To escape notice or be missed by a system that is supposed to detect or catch such things.

सिस्टम की निगरानी या पकड़ से बचना

English Usage: Despite the strict security, a few errors always slip through the net.

Hindi Usage: कड़ी निगरानी के बावजूद, कुछ गलतियां हमेशा जाल से फिसल जाती हैं।