隻 — vessels, no. of ships, fish, birds, arrows, one of a pair

船舶170余隻。

There were approximately 170 ships.

一いち 隻せきの 船ふねに 全部ぜんぶを 積つむ 冒険ぼうけんをするな。

Don't risk putting everything in one boat.

その時、達磨は一隻履、つまり草履を片方だけを手にしていたという。

At the time, Daruma was holding issekibaki, or one of a pair of sandals, in his hand.