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1 da ad. to fall upon sb/sth; to bear down on sb/sth
txakurra gainera joan zitzaion: the dog bore down on him
zorigaizto ikaragarria gaineratu zaio familiari: a terrible tragedy has befallen the family
2 da/du ad. to remain on top; to put on top; to rise to the surface
beti gaineratzen den olioa bezala: like oil, which always rises to the surface
3 du ad. [esandakoari gehitu] to add