1.
If you throw in a remark when having a conversation, you add it in a casual or unexpected way.
Occasionally Farling threw in a question.
= toss in
PHRASAL VERB : V P n (not pron) , also V n P
2.
If a person who is selling something throws in something extra, they give you the extra thing and only ask you to pay for the first thing.
Pay £4.80 for larger prints and they throw in a free photo album...
They were offering me a weekend break in Paris–with free beer thrown in.
= include
PHRASAL VERB : V P n (not pron) , V-ed P , also V n P