Most important, we now know that street violence is not inevitable—it can be reined in.
And both strategies have been reined in by the new police commissioner, William Bratton.
He reined in federal spending by as much as $2.5 trillion and set limits for how much the nation can rack up in debt.
c.1300, "strap fastened to a bridle," from Old French rene, resne "reins, bridle strap, laces" (Modern French rêne), probably from Vulgar Latin *retina "a bond, check," back-formation from Latin retinere "hold back" (see retain). To give something free rein is originally of horses.
c.1300, from rein (n.). Figurative extension "put a check on" first recorded 1580s. Related: Reined; reining. To rein up "halt" (1550s) is from the way to make a horse stop by pulling up on the reins.