Etymology of 'Ally'

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Ben Zimmer, A Friend in Solidarity, on the Battlefield or off, Wall Street Journal, Mar 19, 2021, at page C3
("The word 'ally' has its root in the Latin verb 'alligare,' meaning 'to bind to.' In Old French, the Latin word split off into two directions: 'aloier,' for fusing metals, gave rise to the English word 'alloy,' while another form, 'alier,' is the source of 'ally')

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