Happy, cheerful, and upbeat; having a bright and positive attitude despite difficult circumstances.
Origin uncertain but possibly from 'chip' meaning to cut or break, or related to the chirping of birds. Became common in early 1900s American English as slang for cheerful.
British and American English use 'chipper' in opposite ways sometimes—British people say 'I'm feeling chipper' to mean good, while Americans might say someone is being too chipper meaning fake-happy!
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