To shout with joy or approval, or to make someone feel happier and more hopeful.
From Middle English 'chere' or 'cheer', originally from Old French 'chiere' meaning 'face' or 'expression'. Later it evolved to mean 'mood' or 'disposition', and eventually 'to encourage' or 'to applaud'. The semantic shift happened because facial expression reveals emotion.
At medieval banquets, when the host had a good 'cheer' (happy face), everyone felt the positive energy—this is why 'cheer' went from meaning 'face' to meaning 'encouragement'. Your expression literally spreads happiness to others.
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