STEP Hebrew Lexicon: שָׁאַף

1) to gasp, pant, pant after, long for, breathe heavily

1a) (Qal)

1a1) to gasp, pant after, snuff up

1a2) to gasp or pant (with desire), pant after, be eager for

1a3) to thirst for one's blood (from actions of animals) (fig)