/ ˈwepən; NAmE / noun
1.
an object such as a knife, gun, bomb, etc. that is used for fighting or attacking sb :
nuclear weapons
a lethal / deadly weapon
The police still haven't found the murder weapon .
He was charged with carrying an offensive weapon .
—see also biological weapon , chemical weapon
2.
something such as knowledge, words, actions, etc. that can be used to attack or fight against sb/sth :
Education is the only weapon to fight the spread of the disease.
Guilt is the secret weapon for the control of children.
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IDIOMS
see double-edged
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WORD ORIGIN
Old English wǣp(e)n , of Germanic origin; related to Dutch wapen and German Waffe .