abkochen

Etymology
From.

Verb

 * 1)  to boil down, boil off boil a liquid in order to reduce it, especially to condense a broth
 * 2)  to be so removed or condensed
 * 3)  to reduce weight quickly before a fight
 * 4)  to boil a liquid shortly in order to sanitise it
 * 5)  to stultify, thwart, beat, demoralise (especially through cleverness)