Use 'blaze up' to describe when something combusts vigorously, often unexpectedly.

Literal Fire

'Blaze up' indicates a rapid growth in the intensity or brightness of a fire.

Intensity Increase

The phrase can suggest potential danger or the need for caution when something blazes up.

Use 'blaze up' to communicate a swift, passionate reaction, usually anger or frustration.

'Blaze up' suggests an uncontrolled release of emotions, not just a quiet annoyance.

Through 'blaze up', describe emotions as compelling and forceful, like a fire.