1650s, "to catch fire," from Latin conflagrat-, past participle stem of conflagrare (see conflagration). Meaning "to set on fire" is from 1835.
ignite, incinerate, light, torch, melt, char, heat, blaze, smolder, scorch, sear, flicker, combust, bake, rekindle, toast, scald, flash, parch, singe
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Online Etymology Dictionary, © 2010 Douglas Harper