[как f NP; nom only; adv; fixed WO]
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⇒ (to live) without worrying about the future, free of responsibility and obligations (be <live>) carefree as a (little) bird; (be <live>) without a care in the world; (be) happy-go-lucky.
Большой русско-английский фразеологический словарь. — М.: ACT-ПРЕСС КНИГА. С.И. Лубенская. 2004.