To make alacritous or quick; to increase the speed or eagerness of action (archaic or rare usage).
From alacrity (speed, eagerness) plus -ify (a suffix meaning 'to make'). Alacrity comes from Latin alacritas, from alacer (lively, brisk). The -ify suffix comes from Latin facere (to make).
This word is so rare that most dictionaries don't include it, but it perfectly shows how English speakers can create verbs from adjectives by adding -ify—it's like the language has a creativity hack built in!
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