whetstone

Whatever knife you choose, buy a honing rod, sharpening steel or whetstone.

Meyers' "Late Show" is an extension of his experience hosting "Weekend Update," but it's fair to say that its harder edge was sharpened on the "Daily Show" whetstone.

Over the past two million years huge sheets of ice ground the landscape of central Illinois to a whetstone flatness.

Activities that demand focus and industry are the whetstone to keeping cognition sharp, Merrill says.

Having said that, if there is an episode equivalent to a whetstone against which Stewart honed his sophomore season approach, it may be the first season's penultimate episode about, yes, the media.