Untie
/əˈntaɪ/
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Definition
(verb) To loosen, as something interlaced or knotted; to disengage the parts of.
Sentence Examples
The first thing he did was to untie his shoelaces and take his shoes off.
I can't untie this knot.
CEFR Practice Quiz
I had to ask my friend to help me ____ the heavy knot in my laces after I finished my long morning run today.