King's cushion

a temporary seat made by two persons crossing their hands.
- Wharton's Law Dict.

See also: King

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in classic literature ?
I was assured that, a year or two before my arrival, Flimnap would infallibly have broke his neck, if one of the king's cushions, that accidentally lay on the ground, had not weakened the force of his fall.
On the description of the court of Lilliput in Chapter 3 of Book 1, for instance, Greenberg notes that "Flimnap represents Robert Walpole, the Whig leader; Reldresal, probably Walpole's successor in 1717; the 'King's Cushion,' the King's mistress who helped Walpole return to office (1721) after his 'fall.' The colored threads correspond to the Orders of the Garter, the Bath, and the Thistle" (22).