Princeton's WordNet

1. take heart, buck up(verb)

   gain courage

Wiktionary

1. buck up(Verb)

   To become encouraged, reinvigorated, or cheerful; to summon one's courage or spirits.

2. buck up(Verb)

   To encourage or refresh; to hearten.

3. buck up(Verb)

   To dress oneself up smartly; compare (obsolete) buck ("a fop, dandy")

4. buck up(Verb)

   To pass on to higher authority for resolution. See also pass the buck.

5. buck up(Interjection)

   Cheer up; take courage; take heart.

6. buck up(Interjection)

   Hurry up; make haste.

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