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| NOUN |
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| /ˈtændʒ(ə)nt/ |
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| 1 | technical a straight line that touches the edge of a circle but does not pass through it 切线 |
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| 2 | in a right-angled triangle , the measurement of an acute angle that is equal to the length of the side opposite the angle divided by the length of the side between the angle and the right angle 切正 |
| PHRASE |
| - | go off at/on a tangent informal
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| to suddenly start doing , discussing, or thinking about something completely different |
| 突然做起其他事；突然讨论起其他事；突然想起其他事 |
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| His mind had gone off at a complete tangent. 他突然想到别的事情上去了。 |
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