| bore | (noun) a hole or passage made by a drill; usually made for exploratory purposes | Synonyms: bore-hole, drill hole |
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| (noun) diameter of a tube or gun barrel | Synonyms: caliber, calibre, gauge |
| (noun) a high wave (often dangerous) caused by tidal flow (as by colliding tidal currents or in a narrow estuary) | Synonyms: aegir, eager, eagre, tidal bore |
| (noun) a person who evokes boredom | Synonyms: dullard |
| (verb) make a hole, especially with a pointed power or hand tool | Synonyms: drill |
| (verb) cause to be bored | Synonyms: tire |
| boreal | (adjective) toward or located in the north | - |
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| (adjective) relating to or marked by qualities associated with the north wind | - |
| (adjective) comprising or throughout far northern regions | Synonyms: circumboreal |
| boreas | (noun) a wind that blows from the north | Synonyms: north wind, norther, northerly |
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| borecole | (noun) a hardy cabbage with coarse curly leaves that do not form a head | Synonyms: Brassica oleracea acephala, cole, colewort, kail, kale |
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| bored | (adjective) tired of the world | Synonyms: world-weary |
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| (adjective) uninterested because of frequent exposure or indulgence | Synonyms: blase |
| boredom | (noun) the feeling of being bored by something tedious | Synonyms: ennui, tedium |
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| borer | (noun) any of various insects or larvae or mollusks that bore into wood | Synonyms: woodborer |
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| (noun) a drill for penetrating rock | Synonyms: bore bit, rock drill, stone drill |