The lower part 电 means 'electricity' and was simplified from 電, wherein during rain the lightning rod 乚 in the field has electricity. The big 大 electricity 电 refers to a lightning flash that comes suddenly.
The use of this component is not consistent. From the character for electricity 电 comes the meaning "lightning rod". Also other explanations are used such as "hook" or "kneeling person".
Tip: Go to the radicals that are contained in this character and learn all the characters with this radical systematically!
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