sink or swim

Fig. to fail or succeed. (Alludes to the choices available to someone who has fallen into the water.) After I've studied and learned all I can, I have to take the test and sink or swim. It's too late to help John now. It's sink or swim for him.

Succumb or succeed, no matter what, as in Now that we've bought the farm, we'll have to make a go of it, sink or swim. This expression alludes to the former barbaric practice of throwing a suspected witch into deep water, often weighted down. In case of sinking, the victim died; in case of swimming, the victim was considered in league with the devil and therefore was executed. A related idiom, float or sink, was used by Chaucer in the late 1300s; Shakespeare had the current form in 1 Henry IV (1:3): "Or sink or swim."

If someone has to sink or swim, they have to try to succeed on their own, and whether they succeed or fail depends completely on their own efforts and abilities. After three years of teaching and support at music college, musicians are left to sink or swim in the profession. Note: You can use sink-or-swim before a noun. Tomorrow afternoon, it's sink-or-swim time, her first game.

To fail or succeed without alternative.

Succumb or survive; by extension, no matter what. This term alludes to the ancient practice of throwing a convicted witch (sometimes weighted down) into deep water. In case of sinking, the person drowned; in case of swimming, the person was considered in league with the devil and therefore was executed. Hence the outcome was the same. The term, which began life as float or sink, was already used by Chaucer in the fourteenth century. Shakespeare’s Hotspur said, “Or sink or swim” (Henry IV, Part 1, 1.3), and across the Atlantic, John Adams said, “Swim or sink, live or die, survive or perish with my country was my unalterable determination” (in a conversation with Jonathan Sewall, 1774).