Hover
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late Middle English: from archaic hove ‘hover, linger’, of unknown origin.
wiktionary
From Middle English hoveren, equivalent with hove + -er(frequentative suffix).
Unknown
etymonline
hover (v.)
c. 1400, hoveren, frequentative of hoven "hover, tarry, linger;" see hove (v.1). Related: Hovered; hovering. As a noun from 1510s.