Abstraction knocked down green circles with an orange center on a blue backgroundAbstraction knocked down green circles with an orange center on a blue background
A transport system called a steam locomotive, knocks its wheels outdoorsA transport system called a steam locomotive, knocks its wheels outdoors
A football player in a tackle wants to knock the ball outA football player in a tackle wants to knock the ball out
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Звук, шум от удара, от падения твёрдого предмета. Стукнул (во 2 знач.).