HDO

noun

Elementary

1

Initialism of hold-departure order.

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h H&C H&E H&H H&I H&J H&K H&L H&NC H&P H&Ps h'm h's H+H-1B H-2A H-2B H.C.H.D.H.E.H.H.H.K.H.M.h.q.

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