crack down

You know—why should I crack down on drinking or smoking, for instance, when I do it myself?

The eyes are still closed, but a crack down the center of each is visible by the 13th day.

The sewage escaped into a crack in the rock and followed the crack down vertically and horizontally into the well.

The shock to the latter appeared to have had the effect of jarring it sufficiently to crack down great blocks all along its face.

That crack down in the back lane at Edmonton, Blathers, said Mr. Duff, assisting his colleagues memory.

The reasons that the Soviet Union did not crack down on its former subservient satellite are both obscure and complex.