To buy quickly, usually because the item is a bargain or in short supply or something one has been searching for.(verb)
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Use "snap up" in a sentence
"Australia wished to snap up the whole of German New Guinea and other possessions administered from Rabaul, including the Bismarck Archipelago and the Solomon Islands."
"He had the glass to his eye now, training it first on Algeciras and then upon Tarifa — some well-manned privateer or ship of war might easily dash out to snap up such a defenceless prey as Le Rêve."