throw something ↔ in phrasal verb ( see also ↑ throw )
1 . to add something to what you are selling, without increasing the price:
We paid $2000 for the boat, with the trailer and spares thrown in.
2 . if you throw in a remark, you say it suddenly without thinking carefully:
She threw in a couple of odd remarks about men.
3 . throw in the sponge/towel informal to admit that you have been defeated