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1. To begin to burn. Don't worry, the tinder will flame up eventually.
2. To begin to burn more intensely. The fire suddenly flamed up and crackled even louder.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
1. [for something] to catch fire and burst into flames. The trees flamed up one by one in the forest fire. Suddenly the car flamed up and exploded.
2. [for a fire] to expand and send out larger flames. The raging fire flamed up and jumped to even more trees. As firemen opened the door and came in, the fire flamed up and filled the room.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.