What is "up-ended"

Usage examples of "up-ended".

He and another began to move downstream, carefully examining both banks and casually sur mounting up-ended coffin-sized boulders with no effort.

He and another began to move downstream, carefully examining both banks and casually surmounting up-ended barge-sized boulders with no effort.

Though that safeguard was not yet complete—logs were still waiting to be up-ended and set into place to close its perimeter.

Here you are, in a big house, in a lady's boudoir, with a woman of uneasy virtue,' Madam up-ended the bottle into what appeared to be a blue mug with a teddy bear on it, 'and you appear unfussed.