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Originally Posted by DreadPirateRoberts
What is an "upgrade grub"?
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Typically when you book a cabin on a cruise, you select a specific class of cabin such as "inside", "outside", "balcony" etc... Cruise lines often give out upgrades to a higher level of cabin if the ship is not full. Some people make it their life's ambition to get an upgrade and try all sorts of tricks... That's a grub. The especially obnoxious ones seem to think it's some sort of right and go flaming bonkers when then are actually placed in the cabin they selected and paid for.