I tried the blade of my knife on a wall.

It held something else, too, some kind of knife blade.

I cried out as the knife blade cut the back of my hand.

I tried my knife blade, but that was too thin.

No one would have seen his knife blade under the plastic anyway.

Her eyes flew open and she sat up like a knife blade.

The hostility in his voice was like a knife blade.

To check if it's done make a small hole at the top using a knife blade.

He held it out to her between his thumb and the knife blade.

The rock around it comes away easily beneath my knife blade.