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at all cost(s)

(also at any cost)

Definition

B2 If something must be done or avoided at all costs, it must be done or avoided whatever happens: Security during the president's visit must be maintained at all costs. He wanted her at any cost, even if it meant giving up everything he had.Very important or urgent
(Definition of at all cost(s) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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