Do you feel lucky?
(Hmph, something or rather' someone has come to mind. He will not be feeling lucky.)
Well, if you manage to escape by this much then you're pretty lucky in my book.
Basically, if you escape something by the skin of your teeth, then you've had a very narrow escape.
Use in Normal SpeechEdit
When describing a lucky escape.
"Phew! I just escaped him by the skin of my teeth. Five seconds more and Lord knows what would've happened next."