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• 日(sun; day)ASSOCIATIVE
• 取(take; grasp)PHONO-SEMANTIC

The sun shines highest in the sky, as if grasping the topmost position.

• 口(mouth; door)RADICAL
• 后(behind; empress (figuratively—one who rules from behind))ASSOCIATIVE

A mouth giving orders from behind the golden throne is the authority of an empress.

• 辶(step; move)RADICAL
• 甬(passage; channel; path)PHONO-SEMANTIC

Following a clear pathway or passageway is the meaning of the character.