verb
to fasten or secure with a knot or string
adjective
busy or occupied with something
adverb
in a state of being fastened or secured with a knot or string
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The suspect was tied up and taken into custody by the police.
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I can't go out tonight, I'm all tied up with work.
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I was so tied up in traffic that I missed my appointment.
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Her emotions were all tied up in the decision she had to make.