Definition of tie down phrasal verb from the Oxford Advanced American Dictionary

 

tie down

 phrasal verb
phrasal verb
 
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Phrasal Verbs

tie somebody down (to something/to doing something)

 
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to restrict someone's freedom, for example by making them accept particular conditions or by keeping them busy Kids tie you down, don't they? I don't want to tie myself down to coming back on a particular date.
See the Oxford Advanced Learner's Dictionary entry: tie down