Improved Disarm

Combat Expertise (PH) , INT 13,

You do not provoke an attack of opportunity when you attempt to disarm an opponent, nor does the opponent have a chance to disarm you. You also gain a +4 bonus on the opposed attack roll you make to disarm your opponent.

See the normal disarm rules, page 155.

A fighter may select Improved Disarm as one of his fighter bonus feats (see page 38). A monk may select Improved Disarm as a bonus feat at 6th level, even if she does not meet the prerequisites.

You know how to disarm opponents in melee combat.