noun

1. state of mind or of feeling; mood; spirit: now usually in such phrases as be of good cheer and with good cheer
2. gaiety; gladness; joy
3. festive entertainment, esp. with food and drink
4. anything that comforts or gladdens one; encouragement
5. 1. a glad, excited shout used to urge on, welcome, approve, etc.
   2. a jingle, rallying cry, etc. shouted in unison in rooting for a team
6. Archaic facial expression

Etymology: ME chere, the face, demeanor, bearing, mood < OFr chiere < LL cara, head < Gr kara < IE base *er-, head, horn; modern senses < phr. good cheer (Fr bonne chère)

transitive verb

1. to fill with joy, good spirits, and hope; gladden; comfort: often with up
2. to urge on or encourage by cheers
3. to greet or applaud with cheers

intransitive verb

1. to be or become cheerful; feel encouraged: usually with up
2. to shout cheers