Sentence:  For when he knew his Rival freed and gone, / He ſwells with Wrath; he makes outrageous Moan: / He <WSD>frets</WSD>, he fumes, he ſtares, he ſtamps the Ground; / The hollow Tow'r with Clamours rings around: ... 
Meaning of the word marked with <WSD> tags:  To be chafed or irritated; to be angry or vexed; to utter peevish expressions through irritation or worry.