Given the task definition, example input & output, solve the new input case.
Two analogies that relate actions with their consequences are given in the form "A : B. C : ?". The phrase "A : B" relates action A to consequence B. Your task is to replace the question mark (?) with the appropriate consquence of the given action C, following the "A : B" relation. Your answer should be a single verb, without further explanation.
Example: throw : fly. aspire : ?
Output: attain
Fly is a causation of throw. Hence, the inferred analogy being causation, attain is the causation of aspire.

New input case for you: nourish : grow. ignite : ?
Output:
burn