You may also see it spelt 'draught' (often preferred in Br English). But this draught definition | Dictionary.com just refers to draft definition | Dictionary.com . The relevant definition is 'A current of air in an enclosed space'. This meaning was used to make a pun with the meaning 'draught beer', together with a double meaning of "terrific", in an advertisement for beer: There's a terrific draught at your local.
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