rocking stone

noun

any fairly large rock so situated on its base that slight forces can cause it to move or sway.

rocking stone

a boulder so delicately poised that it can be rocked Also calledloganlogan-stone

First recorded in 1730–40

In this island cave nature had placed a curiosity, known as a rocking stone.

He rested his weight on the rocking stone again and tried to throw it forward; but its balance seemed perfect.

With a smash and a rumble, the rocking stone pitched over the brink of the hill.

The rocking stone, commonly reckoned a Druidical monument, has always been held in superstitious veneration by the people.

On the summit stands the famous Logan rocking-stone, which is said to weigh eighty tons.

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