1. To toss or hurl some person or thing from one side (of something) to the other. A noun or pronoun can be used between "throw" and "across." The rescue team threw across a rope so they could pull me to safety. The kids were too small to jump over the river, so I had to throw them across. He threw the Frisbee across the field to his friend Sarah.
2. To cause something to stretch over or cover someone or something. A noun or pronoun can be used between "throw" and "across." I threw a blanket over my mother after she fell asleep on the sofa. Let's throw a couple of ropes over the cargo to keep it secure while we travel.
throw something across someone or something
to toss or spread something, such as a blanket, over someone or something. Tom threw a blanket across Martha. Tom threw a blanket across his knees.
throw something across something
to toss something over something, from one side of it to the other. Can you throw this stone across the river? Walter threw the ball across the court to Michael.