guān Top: out of 丷, below: heaven 天 - Shows a mountain pass (=lowest section of the ridge), which is "in the sky", but from which it gets higher 丷
(Depending on the weather) A mountain pass can be closed.
zhèng Left: to close 关 (The mountain pass 丷 in the sky 天 is closed.), right: village⻏ (If this radical⻏ is at the right it means village, otherwise: hill)
If the mountain pass is closed, for the village this will be: serious.