Définitions
1.NounAlternative form of throw-in.
2.VerbUsed other than figuratively or idiomatically: see throw, in.
3.VerbTo add something extra free of charge."If you take the large size, we'll throw in a set of tea towels."
4.VerbTo include in a calculation.
5.VerbTo quit, to fold. (Can we add an example for this sense?)
6.VerbTo inject, as a fluid.