rocking stone

American  

noun

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

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rocking stone British  

noun

1. Also called: logan.   logan-stone.  a boulder so delicately poised that it can be rocked

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Etymology

Origin of rocking stone

First recorded in 1730–40

Example Sentences

"That's all we've got" He leaned his spear against the rocking stone and pushed back two handfuls of hair.

From Literature

On the declivity of a hill on Ashover Common is a rocking stone, called Robin Hood's Mark, which measures about twenty-six feet in circumference.

From Project Gutenberg

A singular rocking stone, formerly an idol.

From Project Gutenberg

In reality the two masses are detached, the superimposed one so loose as to have obtained the character of a “rocking stone.”

From Project Gutenberg

Once, with the intention of lending a helping hand, I stepped forward upon a block of granite which happened to be poised like a rocking stone upon the ice, though I did not know it; it treacherously turned under me; I fell, but my hands were in instant requisition, and I escaped with a bruise, from which, however, the blood oozed angrily.

From Project Gutenberg