[1] : WordNet (r) 2.0

buck up
     v : gain courage syn: take heart
see also:
take heart 

[2] : Moby Thesaurus II by Grady Ward, 1.0

47 moby thesaurus words for "buck up":
   animate, assure, bolster, brace, brace up, brighten up, brisk,
   brisken, cheer, cheer up, chirk up, console, embolden, encourage,
   enliven, exhilarate, fortify, fresh up, freshen, freshen up,
   hearten, inspire, inspirit, invigorate, light up, nerve, perk up,
   pick up, quicken, reanimate, reassure, recreate, refresh,
   refreshen, regale, reinvigorate, renew, revive, revivify, set up,
   solace, stimulate, support, take courage, take heart, upraise,
   vivify

Ball Up >> B Words
Ball Up, definition of term: Ball Up
ball+up_pag1.html

Bang Up >> B Words
Bang Up, definition of term: Bang Up
bang+up_pag1.html

Backed Up >> B Words
Backed Up, definition of term: Backed Up
backed+up_pag1.html

Back Up >> B Words
Back Up, definition of term: Back Up
back+up_pag1.html

Ante Up >> A Words
Ante Up, definition of term: Ante Up
ante+up_pag1.html

Act Up >> A Words
Act Up, definition of term: Act Up
act+up_pag1.html