11.Nautical. to bleed the buoys: to let the water out.
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society > travel > travel by water > other nautical operations > [verb (intransitive)] > let water out
to bleed the buoys1834
1834 F. MarryatPeter Simple I. vi. 66 ‘And, Mr. Chucks, recollect this afternoon that you bleed all the buoys.’ Bleed the boys, thought I, what can that be for?