01 adv. With might; with full force; vigorously; violently; exceedingly.
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1.
With might; with full force; vigorously; violently; exceedingly.“They on the hill, which were not yet come to blows, perceiving the fewness of their enemies, came down amain.” — Milton.“That striping giant, ill-bred and scoffing, shouts amain.” — T. Parker.
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2.
At full speed; in great haste; also, at once.