What is "chacing"

Usage examples of "chacing".

W Ho now does follow the foule Blatant Beast,Whilest Calidore does follow that faire Mayd,Vnmyndfull of his vow and high beheast,Which by the Faery Queene was on him layd,That he should neuer leaue, nor be delaydFrom chacing him, till he had it attchieued?

And when the false moon steals away, Or e'er the chacing morn doth rise, Oft, fearless, we our gambols play By the fire-worm's radiant eyes.