Chain, Chains
noun
The kanji and the word are exactly the same. That means they share meanings as well.
くさり
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!
逃げないように鎖で繋いでいます。
They were tied with chains so they wouldn’t escape.