to bring safely out of danger: to deliver, rescue, or come safely through.
One idea runs through every use of this word: being brought out of danger and into a safe place. It is not simply fleeing from harm. Its accent falls on arriving at safety, which is why the Bible reaches for it above all to describe God rescuing the person who trusts him. In the Psalms he is the one who does the delivering almost every time, and the word settles into a favorite title for him: my deliverer.
Because the picture is arrival at safety rather than mere flight, the word bends easily to related situations. A lion carries its prey off to a safe spot where no one can take it back. A person prays to be brought through a trial and come out free. In one striking case a cow safely brings forth her calf without losing it, keeping the old, physical picture of something being brought safely out.
These are shades of a single idea, not separate words. What holds them together is the movement from peril to safety, and the sense that someone, usually God, is the one who accomplishes it. English has to rotate among several words to catch it: deliver, rescue, save, escape, even bring forth.