They were tied with chains so they wouldn’t escape.
The kanji and the word are exactly the same. That means they share meanings as well.
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!