informal to start to take an interest
to rise from a reclining to a sitting position
to sit with the back straight
to stay up after the usual time for going to bed
informal to show interest, alertness, or surprise
| 单词 | sit up |
| 释义 | sit upverb intransinformal to start to take an interest to rise from a reclining to a sitting position to sit with the back straight to stay up after the usual time for going to bed informal to show interest, alertness, or surprise |
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