The Collaborative International Dictionary
Rocking-stone
Rocking-stone \Rock"ing-stone`\, n. A stone, often of great size and weight, resting upon another stone, and so exactly poised that it can be rocked, or slightly moved, with but little force.
Usage examples of "rocking-stone".
Two weary, worn-out men, one of them on the wrong side of forty, a rocking-stone to take off from, a trembling point of rock some few feet across to land upon, and a bottomless gulf to be cleared in a raging gale!
I pushed the board on to Ayesha, who deftly ran it across the gulf so that one end of it rested on the rocking-stone, the other remaining on the extremity of the trembling spur.