Sea-Sick
Feelling a bit &quot;green around the gills&quot;.

The phenomenon of seasickness is a form of motion sickness characterized by a feeling of nausea and, in extreme cases, vertigo, experienced after spending time on a craft on water.

Some times even experienced sailors get sick!
(I know from experience).

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The origin of this idiom is lost, though it seems to have appeared in the mid-1800s. Fish gills are normally red. Presumably, a fish with green gills is a sick fish. 
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