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
References in classic literature ?
George salutes the gentleman but otherwise sits bolt upright and profoundly silent--very forward in his chair, as if the full complement of regulation appendages for a field-day hung about him.
Now that she is here she remains for a time, and though she is in the arm-chair by the fire, where she sits bolt upright (she loved to have cushions on the unused chairs, but detested putting her back against them), and I am bent low over my desk, I know that contentment and pity are struggling for possession of her face: contentment wins when she surveys her room, pity when she looks at me.
The guy in charge of naming new Sony products sits bolt upright in bed, cold sweat dripping from his forehead.
Looking confused, Williams sits bolt upright in her bed in Blacon as PC Jane Davies reads her rights to her.
"He drinks the coffee, apparently sits bolt upright but is completely out of it, comatose.
YODELLING cobbler Bill Gore sits bolt upright on the edge of his sofa.
My son, however, sits bolt upright, happy and smiling, ready for the off, the very nanosecond he wakes up.
Whenever that ad is on, she sits bolt upright and yells `bollocks' at the screen.