Footstool - (Easton's Bible Dictionary)
Connected with a throne (2 Chr. 9:18). Jehovah symbolically dwelt in the holy place between the cherubim above the ark of the covenant. The ark was his footstool (1 Chr. 28:2; Ps. 99:5; 132:7). And as heaven is God's throne, so the earth is his footstool (Ps. 110:1; Isa. 66:1; Matt. 5:35).
Footstool - (Webster's 1828 Dictionary)
FOOT'STOOL, n. A stool for the feet; that which supports the feet of one when sitting.
To make enemies a footstool, is to reduce them to entire subjection. Psa 110.
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