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Hello, and thanks again, Do you think you have another example for me?
I still dont understand that. sorry to bother
thANK YOU
A tug here is a noun here and means a strong pull or a pulling force (dict.).
more examples:
I felt a tug in my heart when I saw the old person lying on the street.
Mr Wislon gave his dog a quick tug on the leash.
Mary hates boys in her class. They love to tug (v.) on her pigtails.
feel a tug on the ribbon 
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