רָבַע
From LSJ
English (Strong)
a primitive root (rather identical with רָבַע through the idea of sprawling "at all fours" (or possibly the reverse is the order of deriv.); compare אַרְבַּע); properly, to be four (sided); used only as denominative of רֶ֫בַע; to be quadrate: (four-)square(-d).
a primitive root; to squat or lie out flat, i.e. (specifically) in copulation: let gender, lie down.