Origin: 1300–50; Middle English < Middle French abatre to beat down, equivalent to a-a-5 + batre < Late Latin batere for Latin battuere to beat; a- perhaps also understood as a-3
late 13c., from O.Fr. abattre "beat down, cast down," from L. ad "to" + battuere "to beat" (see batter (v.)). Secondary sense of "to fell, slaughter" is in abatis and abattoir.