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| English | Czech |
| open lawn Any relatively unobstructed field of cultivated and mown grass, especially near a house or in a park | trávník volný |
| open sea The high seas lying outside the exclusive economic zones of states. All states have equal rights to navigate, to overfly, to lay submarine cables, to construct artificial islands, to fish, and to conduct scientific research within the high seas | moře volné |
| open sea fishing Fishing in the deepest parts of the sea | rybolov na moři volném |
| worked-out open cut A mine where all the mineral that could be profitably exploited has been removed | důl povrchový vytěžený |