proof (n.) 1
tested strength, proven power of resistance, impenetrability
2H6 IV.ii.57 [Smith aside to his companions, of Cade] He need not fear the sword, for his coat is of proof
AC IV.viii.15 [Antony to Cleopatra] leap thou ... / Through proof of harness to my heart
Cym V.v.5 [Cymbeline to all, of the soldier] whose naked breast / Stepped before targes of proof
Ham II.ii.488 [First Player to all, of Mars' armour] forged for proof eterne
Mac I.ii.56 [Ross to King, of Macbeth] lapped in proof [i.e. armour of tested strength]
R2 I.iii.73 [Bolingbroke to John of Gaunt] Add proof unto mine armour with thy prayers
R3 V.iii.220 [King Richard to Ratcliffe] ten thousand soldiers / Armed in proof [i.e. armour of tested strength]
RJ I.i.210 [Romeo to Benvolio, of his love] in strong proof of chastity well armed
Tim IV.iii.125 [Timon to Alcibiades] Put armour on thine ears and on thine eyes, / Whose proof nor yells of mothers, maids, nor babes ... / Shall pierce a jot
TS II.i.140 [Petruchio to Baptista, of being prepared for Katherina's words] Ay, to the proof, as mountains are for winds
Ven 626 [Venus to Adonis, of a boar] His brawny sides .. / Are better proof than thy spear's point can enter