re "
het gaat hier niet om de zeedeining (een vrij technisch begrip)
maar om het op en neer gaan (deinen) van het schip waar hij zo lang op heeft gezeten: rocking, bobbing, rolling"
Nice try, freek, but you obviously don't understand the English term "swell".
Maybe this will help:
• Slicing the Silence: Voyaging to Antarctica, by Tom Griffiths:<tt>"On board the Aurora with Ernest Shackleton in 1916, Fred Middleton took a little while to find his sea legs. The ocean swell frequently sent him running to the ship’s rails where he paid his ‘homage to Father Neptune’."</tt> (Google Books preview:
http://goo.gl/IM6nUx )
• Oxforddictionaries.com:swell: A slow, regular movement of the sea in rolling waves that do not break
Usage examples:
<tt>"there was a heavy swell"</tt>
<tt>"As the yacht surged and rolled over the swell, every movement was magnified enormously at the top of the mast."</tt>
<tt>"With airspeed picked up, the lumbering giant quit moving with the movement of the heavy swells and leaving one crest we ploughed into the next."</tt>
<tt>"We watched swells break on the point and come around into the anchorage with curling graybeard tops."</tt>