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sink or swim

Definition

If someone leaves you to sink or swim, they give you no help so that you succeed or fail completely by your own efforts: My employer gave me no help when I started my new job - I was just left to sink or swim.Coping and not copingDealing with things or peopleTolerating and enduring
(Definition of sink or swim from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)