be vast and endless, broad
竑 centers on vastness and breadth: something immeasurably wide, endless, or broad in extent.
竑 combines 立 (stand) with 厷, which likely contributes the sound and may relate to a large arm or span, together suggesting something standing broad and vast.
The left side 立 (stand) and the right side 厷 (which looks like a wide arm reaching out) together suggest standing with arms stretched wide, measuring an endless, broad space.
For コウ, imagine a vast, broad plain stretching to the horizon, and a single cow standing in the middle: cow -> コウ, and the plain is endless.