onshorePronunciation: /ˈɒnʃɔː/Translate onshore | into Italian | into Spanish Definition of onshore adjective & adverb situated or occurring on land (often used in relation to the oil and gas industry): [as adjective]:an onshore oilfield (especially of the wind) from the sea towards the land: a slight onshore breeze [as adverb]: we moved onshoreonshore in other Oxford dictionaries Definition of onshore in the US English dictionary