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put sth down

(KILL) phrasal verb with put
 
 
/pʊt/ verb (present tense putting, past tense and past participle put)

Definition

to kill an animal that is old, sick, or injured, to prevent it from suffering: If a horse breaks its leg, it usually has to be put down.Veterinary medicineKillingMurder and attempted murder
(Definition of put sth down (KILL) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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