h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

"Steal — to move, go or come secretly, quietly or unobserved."

Is that really supposed to say "steal"?

Yep. Steal has more than one meaning - the modern usage meaning 'to take without permission' comes from the way it would be taken - by stealing (the use of stealth).

Oh, fair enough! I've never heard that before.

I think the only modern usage is in sentences such as 'and he stole away into the night', so you're probably not the only one who doesn't use the word that way

Well now you mention it, I have heard it in that sense.