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v. jelled, jell·ing, jells
1. To become firm or gelatinous; congeal.
2. To take shape or become clear; crystallize: A plan of action finally jelled in my mind.
1. To cause to become firm or gelatinous: used pectin to jell the jam.
2. To cause to take shape; make clear and definite; crystallize.
[Probably back-formation from jelly.]