It would be useful to know what one
refers to, but the meaning of the expression is clear without
it. If something is thrown in, it is included in something
you are paying for at no extra cost. Here is the example from
the Macmillan
English Dictionary:
Buy a computer now and get a free printer
thrown in!
This means that the shop is so eager to sell
you a computer that it will give you a printer at no extra
cost, in order to encourage you to go there rather than to
another shop. (Whether you can ever really get anything for
nothing is a different question, and not a linguistic one!)
And here's another about children's parties:
Swimming, football, party games, bouncy
castling or rollerblading to disco music all
are on offer at the Oasis Leisure Centre in Swindon. A meal,
a toy and a fizzy drink is thrown in with every booking.
In this case you pay for the activity and
the food, toy and drink are free.
MED classifies this as a phrasal verb, because
it consists of a verb (throw) plus a particle (in)
and has a meaning beyond that of its constituent parts (that
is, it doesn't mean the same as throw in in the sentence
'I threw a stone in the water'.) To this extent
it is idiomatic, like all phrasal verbs.
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