abrunden

Etymology
From.

Verb

 * 1) to round off give something a smooth, roundish form, especially by filing the edges
 * 2)  to round off; to top off complete or finish something, give it a satisfying form
 * 3)  to round down round towards a lesser amount
 * 1)  to round down round towards a lesser amount
 * 1)  to round down round towards a lesser amount