[f. CHASE v.1 + -ING2.] Pursuing, following, driving.

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1669.  Sturmy, Mariner’s Mag., I. I. 18. It blows a brave chaseing Gale of Wind.

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1670.  Milton, Hist. Eng., IV. Wks. (1851), 166. [He] return’d fiercely upon the chaseing Enemy.

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