Etymology 1880, from the phrase over the side (of a ship), equivalent to over + side.
1
Located or positioned over the side, especially of a ship.
overside cargo
It is, of course, possible to work only to or from lighters in this way, and such working is not very general in this country, although a certain amount of such overside work is carried on in enclosed docks.1945 January and February, T. F. Cameron, “Dock Working”, in Railway Magazine, page 9:
2
On the opposite side.
overside
adv
Etymology 1880, from the phrase over the side (of a ship), equivalent to over + side.
1
Over the side.
The cargo was dumped overside by the crew.
Then the caplin moved off, and five minutes later there was no sound except the splash of the sinkers overside, the flapping of the cod, and the whack of the muckles as the men stunned them.1897, Rudyard Kipling, Captains Courageous:
overside
noun
/ˈəʊvə(ɹ)ˌsaɪd/
Etymology From over- + side.
1
The side facing up or positioned above; the topside; surface.
[…] that is, glued to the underside of one card and the overside of the next, thus keeping their edges close and parallel to each other, […]1882, English mechanic and world of science: Volume 34 - Page 547
While the overside of the tiles was well smoothed, the underside was in general left crude and rough.1981, Berit Wells, Opuscula Romana XIII: Volume 13:
1 more example
This chapter contains some of the most humorous writing on the overside of the narrative, and the most serious on the underside.1999, Pynchon notes: Issues 40-41