Phew
来自Big Physics
early 17th century: imitative of puffing.
wiktionary
An onomatopoeia: the sound of rapid exhalation one makes when some trying situation is over. Attested since the early seventeenth century. Compare Scots feuch or Spanish fu or Czech fuj.
etymonline
phew
vocalic gesture originally expressing weariness, disgust, etc., attested from c. 1600.
