sit bolt upright

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sit bolt upright

1. To have a very erect posture while sitting. The teacher demands that we all sit bolt upright during the lesson, scolding us should we begin to slouch. The seat of the train was so stiff that I ended up sitting bolt upright for nearly three hours.
2. To very suddenly or abruptly assume an erect posture while sitting. I awoke from the nightmare and sat bolt upright in my bed. We all sat bolt upright when the principal suddenly barged into class.
See also: bolt, sit, upright

sit bolt upright

to sit up straight. Tony sat bolt upright and listened to what the teacher was saying to him. After sitting bolt upright for almost an hour in that crowded airplane, I swore I would never fly again.
See also: bolt, sit, upright