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 "Lord of the Flies" by William Golding

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 Curiosities of Great Britain: England and Wales Delineated Vol.1-11 Historical, Entertaining & Commercial; Alphabetically Arranged. 11 Volume set. by Dugdale, Thomas Cantrell

Then he went to the rocking stone, and pushing it back, took from the niche, one by one, the bags of coin.

From Pocket Island A Story of Country Life in New England by Munn, Charles Clark

Half an hour's travel ought to bring us to the rocking stone at the entrance, and safety.

From Jacqueline of Golden River by Coleman, Ralph P. (Ralph Pallen)

In Bronx Park in New York the "rocking stone" always attracts attention.

From Earth and Sky Every Child Should Know Easy studies of the earth and the stars for any time and place by Rogers, Julia Ellen