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Answer variants:
it refers to something that can be done quickly, in a blink of an eye
cleaning away dirt and dust by scrubbing
something that is unstable and shaky
smiling at someone or something with satisfaction and joy
1. wobbly \(=\)
 
2. brushing \(=\)
 
3. winking \(=\)
 
4. smirking \(=\)