unter Tage

Literally, “under day”. In the mining sense, Tag refers to the (sun-lit) surface of the earth. In the temporal sense, unter is used in the sense of “during”, which is an Upper German idiom, except in the universally common phrase unter der Woche (“during the week”).

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unter Tage

1. (chiefly mining, sometimes construction) underground, belowground, in a shaft or tunnel

   Antonym: über Tage

• untertage

• Untertagebau

unter Tage

1. (Austria, Switzerland, sometimes Southern Germany) during the daytime

   Synonyms: tagsüber, über Tag, am Tag

   Antonyms: nachts, in der Nacht

• unter Tag, untertags