Etymology
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sorehead (n.)

"mean, discontented person," 1848, American English, from sore (adj.) + head (n.). Especially in 19c. U.S. political slang, a person who is dissatisfied through lack of recognition or reward for party service (1862).

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Definitions of sorehead

sorehead (n.)
someone who is peevish or disgruntled;
From wordnet.princeton.edu