hawk
鶃 centers on a hawk, a bird of prey. The meaning is specific to this type of bird.
鶃 combines 鳥 (bird) with 兒, which likely contributes the sound. The exact historical development is uncertain.
The left side is 鳥 (bird), and the right side 兒 looks like a child. Imagine a hawk as a fierce bird that watches over its young like a protective parent.
For ゲキ, picture a hawk letting out a sharp, dramatic cry: 'geki!' The sound cues ゲキ while the hawk swoops down.