From Middle French observer, from Old French, from Latin observare ("to watch, note, mark, heed, guard, keep, pay attention to, regard, comply with, etc."), from ob + servare, from Proto-Indo-European *serw- ("to guard"). Cognate with Gothic 𐍃𐌰𐍂𐍅𐌰 ("weapons, armour"), Old English searu ("device, design, contrivance, art, cunning, craft, artifice, wile, deceit, stratagem, ambush, treachery, plot, trick, snare, ambuscade, cleverness, machine, engine, fabric, armor, equipment, arms").
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