Give him an inch, he’ll take an ell.
More Dutch Proverbs:
How we apples swim! said the horse-turd.Dutch
Who runs is followed.
Dutch
Even hares pull a lion by the beard when he is dead.
Dutch
Don't throw away your own shoes till you have got new ones.
Dutch
Every flail on the oats.
Dutch
The fly flutters about the candle till at last it gets burnt.
Dutch