Wiktionary
vb. 1 (context transitive English) To remove something by plucking from e.g. the ground. 2 (context intransitive English) to become more cheerful 3 (context transitive English) To muster; summon positive emotion (especially courage) 4 (context sports transitive English) To sign; purchase a player.
Usage examples of "pluck up".
Harry did not look to be perfectly satisfied, but he brightened when Alverstoke suggested that if Felix did not pluck up as fast as he should, when he was carried home, Harry should certainly consult a London physician.
In what follows, each of you must pluck up a sack: fix in your minds now just where they are.
Well, the wrong side might have done the routing, but goblins now lay dead in their thousands on this rolling field-yet there still seemed to be many around, stooping among the slain to pluck up swords and knives and coins.
Once she'd startled a hare into full crashing flight through the trees, but for the most part she moved through the mists like a drifting shadow, dipping gentle fingers to pluck up what food she needed.
The fear of negro insurrections at the neighboring plantations being temporarily lulled, the gentry began to pluck up courage for their usual amusements.