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(common) cold; influenza; flu; ague; inflammatory respiratory system illness (in general)
風邪をひいて熱が出た。
I caught a cold and got a fever.
風邪が治るまで家で休んでね。
Rest at home until your cold gets better.
冬は風邪をひきやすいから気をつけている。
I'm careful in winter because it's easy to catch a cold.