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Marksmen and other basic-attack heroes do most of their damage through attack speed. Some defense items slow it whenever they hit you.
The longer a high attack speed hero is allowed to attack you, the more damage they deal.
In our item data, three defense items lower the attacker's attack speed when they damage you: Black Ice Shield, Dominance Ice and Chastise Pauldron.
Numbers and effects below are the in-game text from our database, not typed in by hand.

Defense item ยท 880g
Lowers the attacker's attack speed when its owner takes damage.
Arctic Cold. Taking damage will reduce the Attack Speed of the attacker to 90% of normal for 1s.

Defense item ยท 2010g
The same effect, and it also cuts the attacker's shield and HP regen effects.
Arctic Cold / Lifebane. Taking damage will reduce the Attack Speed of the attacker to 80% of normal for 1s. Taking damage will reduce the Shield and HP Regen effects of the attacker to 50% of normal for 1s.

Defense item ยท 2100g
Lowers the attacker's attack speed and their attack speed cap.
Chastise / Redemption. Chastise: Taking damage will reduce the Attack Speed and Attack Speed cap of the attack to 75% of normal for 2s. Redemption: When incoming damage reduces HP below 30%, recover 20% Max HP over the next 2s (60s cooldown).
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