constrain - definition and synonyms

verb [transitive] formal 

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present tense
present participleconstraining
past tenseconstrained
past participleconstrained
  1. 1
    to limit someone’s freedom to do what they want

    We are always constrained by our budget.

  2. 2
    [usually passive] to force someone to do something that they do not want to do
    feel constrained to do something:

    She should have kept quiet, but felt constrained to answer.