To set on fire, to ignite passion or anger, or to cause intense emotional excitement.
From 'en-' (to cause to be) plus 'flame.' Literally means to cause something to burn with flames, but evolved to mean kindling intense emotions.
Shakespeare loved this word because it's perfect for describing love and rage—passions that literally feel like fire inside you. It's why 'inflame' (with the 'in-' prefix) became the preferred modern spelling.
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