walking blood bank
n.— «That day was mad, with every surgeon and anesthetist in a constant sprint, and the I.C.U. full, blood everywhere. We emptied the blood bank and had to activate the walking blood bank. Soldiers lined up outside the hospital a hundred deep to donate.» —“Market Forces” by Kevin Patterson New York Times July 1, 2007. (source: Double-Tongued Dictionary)
Further reading
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