buck up

from Wiktionary, Creative Commons Attribution/Share-Alike License

• interj. Cheer up; take courage; take heart.
• interj. Hurry up; make haste.
• v. To become encouraged, reinvigorated, or cheerful; to summon one's courage or spirits.
• v. To encourage or refresh; to hearten.
• v. To dress oneself up smartly; compare (obsolete) buck ("a fop, dandy")
• v. To pass on to higher authority for resolution. See also pass the buck.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• v. gain courage