To slay (cut one's throat) with a leaden SWORD

Insights

Effortless victory

It signifies defeating an opponent with ease, specifically in debate. To 'slay with a leaden sword' is to win an argument using weak, flimsy, or non-rigorous proofs because the opponent is so incompetent that even a poor weapon suffices.

Humiliating defeat

For the loser, it implies the shame of being conquered by something that shouldn't be lethal. It highlights their fragility rather than the victor's strength.

Non-threatening harm

In some contexts (like Shakespeare's 'Love's Labour's Lost'), it suggests an injury that is felt but not fatal—emotional wounding that lacks the gravity of tragedy, or a mock-attack that hurts one's pride more than one's body.

Rhetorical terminology

Cooper (1559) and Baret (1580) explicitly define this as a term of logic and rhetoric ('to convince with a weak argument'). In the academic duels of the Renaissance, knowing this proverb allowed a scholar to insult an opponent's defense: 'I defeated you with a leaden sword' meant 'Your position was so weak I didn't even need my best logic.'

Erasmian Wit

Erasmus collects this ('Plumbeo jugulare gladio') as a classic adynaton (impossibility) turned metaphor. It plays on the paradox that lead, the softest metal, achieves the result of steel, the hardest metal, solely due to the weakness of the target.

Shakespearean Irony

In *Love's Labour's Lost*, Boyet says 'There's an eye / Wounds like a leaden sword.' This is a complex joke. Cupid’s arrows were famously tipped with gold (for love) or lead (for aversion). A 'leaden sword' is thus an oxymoron—a weapon of love that is heavy, dull, and perhaps repels rather than attracts, mocking the clumsy courtship of the lords.

Cushion Cousins

The cross-references to 'kill a man with a cushion' reveal a sub-genre of proverbs about 'soft killing.' These sayings collectively explore the theme of paradoxically gentle destruction, where softness, comfort, or weak arguments can be just as fatal as sharp steel.

Rhetorical Devices

Oxymoron

The phrase 'leaden sword' combines the idea of a cutting weapon with a material that cannot hold an edge, creating an image of impossible violence.

Hyperbole

It exaggerates the weakness of the weapon to emphasize the feebleness of the victim.

Paradox

The act of 'cutting a throat' (a precise, sharp action) with 'lead' (a blunt, malleable material) creates a cognitive dissonance that makes the insult memorable.