verb /tæks/
  1. (tax somebody/something) to need a great amount of physical or mental effort
    • The questions did not tax me.
    • The problem is currently taxing the brains of the nation's experts (= making them think very hard).
Origin: Middle English (also in the sense ‘estimate or determine the amount of a penalty or damages’): from Old French taxer, from Latin taxare ‘to censure, charge, compute’, perhaps from Greek tassein ‘fix’.

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