Reciprocal altruism
BEHAVIOUR WHEREBY AN ORGANISM ACTS IN A MANNER THAT TEMPORARILY REDUCES ITS FITNESS WHILE INCREASING ANOTHER ORGANISM'S FITNESS
Altruistic reciprocity; Mutual advantage; Moralistic aggression
In evolutionary biology, reciprocal altruism is a behaviour whereby an organism acts in a manner that temporarily reduces its fitness while increasing another organism's fitness, with the expectation that the other organism will act in a similar manner at a later time.