Left: thread 纟/糸, right: toad 黾 (The animal 口 on the field 田 with the long tongue 乚. HERE: At the rope-maker the rope 乚 is clamped in two holding jaws 口,臼 for being twisted.)
Mnemonic
Threads are clamped twice (and then twisted) to make a rope 乚.
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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