Wiktionary
vb. 1 (context transitive English) To finish. 2 (context mathematics transitive English) To glue a relatively uncomplicated compact manifold to a manifold of the same dimension along (a component of the latter's boundary).
WordNet
v. finish or complete, especially with some decisive action; "he capped off the meeting with a radical proposal"
Usage examples of "cap off".
Grasping his collar in one hand while pulling Raffaello's cap off with the other, he stood the man up and punched him hard in the gut forcing the air out with a gasp.
The King suggests we scare the Red Cap off with one of his own teeth.
The fellow with the horse laugh swiped the other fellow's baseball cap off his head and thought it was funny.
When I saw him last, he took his cap off, took out the little bundle of old letters, hung his cap on the back of the chair his coat was there already, for he had pulled that off, before he went to put the shutters up, and I left him turning the letters over in his hand, standing just where that crumbled black thing is upon the floor.
He still had his cap off, and his dark hair was sticking up in tufts.