That means a sharpened knife. The knife has been applied to a whet stone and is nice and sharp.
Comes from: Whetstone used to sharpen Blades such as knifes
The beach in the winter
Definitions: wind: the movement of air whetted: sharpened knife: a blade, usually of metal Looking up the terms shows you that this comparison is saying that the wind blew so strongly that it felt like it was cutting.
"He whetted his appetite!"
To whet means to rub on the surface of a flat stone to create a sharp edge
The unduly media attention to the case whetted the curiosity of common man
wedded
knife
AKA Shaman - 2011 Wetted Wings and a Whetted Wrist 1-7 was released on: USA: 1 June 2011
If you mean a regular straight blade knife and not a pocket knife, the case is called a sheath.
In Sea Fever, poet John Masefield wrote "I must down to the seas again, to the vagrant gypsy life, to the gull's way and the whale's way, where the wind's like a whetted knife." Great old poems like that whet everyone's appetite for more
Do you possibly mean a knife that is attached to the front of a rifle? If so, that is a bayonet.