Darren] Well, there's the Simpsons' 'debigulator' machine, which rather implies that there's a verb 'to debigulate'

More seriously, since the 'en-' prefix mostly seems to mean 'more of', or 'increase' you wouldn't really expect a word for making smaller to be made up in that way. There is 'decrease', which is a Latinate construction of 'de-' and crescere, to grow.

[penelope] which sense of "dogging" are you talking about?

[Phil] Perhaps it's best we don't ask.

[Phil] In the 'following someone annoyingly' sense. Why, what other senses are there? ;o)

[Irouléguy] Doesn't the prefix 'en-' mean something closer to 'to make'? (Enlarge - to make sth large).
Actually, the example that made me think that was ennoble - to make noble.