Definition of "knife" []

• A cutting instrument consisting of a sharp blade attached to a handle. (noun)
• A cutting edge; a blade. (noun)
• To use a knife on, especially to stab; wound with a knife. (verb-transitive)
• Informal To betray or attempt to defeat by underhand means. (verb-transitive)
• To cut or slash a way through something with or as if with a knife: The boat knifed through the waves. (verb-intransitive)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Somebody comes forward, examines, and then draws from out the grave, where it has lain, directly under the body, a knife -- a knife of peculiar shape and workmanship -- a long, keen, _surgeon's knife_!"
• "A man with a knife is approaching a woman with her baby."
• "If you don't have a gun, then a knife is the best survival tool."