There is one meaning in OED's entry for the verb phew. See ‘Meaning & use’ for definition, usage, and quotation evidence. How common is the verb phew? Fewer than 0.01 occurrences per million words in modern written English. How is the verb phew pronounced? Where does the verb phew come from? The earliest known use of the verb phew is in the 1850s. More @Wikipedia
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