| threshold | (noun) the sill of a door; a horizontal piece of wood or stone that forms the bottom of a doorway and offers support when passing through a doorway | Synonyms: doorsill, doorstep |
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| (noun) the entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close | Synonyms: door, doorway, room access |
| (noun) the smallest detectable sensation | Synonyms: limen |
| (noun) a region marking a boundary | Synonyms: brink, verge |
| (noun) the starting point for a new state or experience | - |
| tortoiseshell | (noun) a cat having black and cream-colored and yellowish markings | Synonyms: calico cat, tortoiseshell-cat |
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| (noun) brilliantly colored; larvae feed on nettles | Synonyms: tortoiseshell butterfly |
| (noun) the mottled horny substance of the shell of some turtles | - |
| traineeship | (noun) financial aid that enables you to get trained for a specified job | - |
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| tribuneship | (noun) the position of tribune | - |
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| troubleshoot | (verb) solve problems | Synonyms: trouble-shoot |
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| troubleshooter | (noun) a worker whose job is to locate and fix sources of trouble (especially in mechanical devices) | Synonyms: trouble shooter |
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| trusteeship | (noun) the position of trustee | - |
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| (noun) a dependent country; administered by another country under the supervision of the United Nations | Synonyms: trust territory |
| unrefreshed | (adjective) not rested or refreshed | Synonyms: unrested |
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| yeshiva | (noun) an academy for the advanced study of Jewish texts (primarily the Talmud) | Synonyms: yeshivah |
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| yeshivah | (noun) an academy for the advanced study of Jewish texts (primarily the Talmud) | Synonyms: yeshiva |
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