On a ship, if you go topside, you go up onto the top deck. He left the control station and went topside
The topside or topsides of a ship or boat are the top deck or the parts which you can see above the water. high quality beef cut from the upper leg of the cow American Equivalent: top round
The side of a boat between the waterline and the deck; referring to onto or above deck
Topside is a joint of beef that is cut from the upper part of the cow's leg. It is usually cooked by roasting or stewing