'Fast' in the Bible

Who, having received such a charge, thrust them into the inner prison, and made their feet fast in the stocks.

Now when much time was spent, and when sailing was now dangerous, because the fast was now already past, Paul admonished them,

And falling into a place where two seas met, they ran the ship aground; and the forepart stuck fast, and remained unmoveable, but the hinder part was broken with the violence of the waves.