Since this word is made up of a single kanji, it probably uses the kun'yomi reading. You did not learn this reading, so here's a mnemonic to help you:
The best way to break out of the chains life puts on you is to put on a cool sari (くさり). A cool sari will remind you where you come from. Who your family is. And how beautiful you look. Cast off those chains and put on a cool sari!
They were tied with chains so they wouldn’t escape.