
Do a slow burn
Subtle Intensity
It expresses building anger discreetly, without immediate confrontation.

After the meeting's passive-aggressive comments, I was doing a slow burn.
Extended Time
The anger doesn't peak instantly; it builds over time.

Throughout the chess match, my opponent's smugness had me doing a slow burn.
Controlled Reaction
The person remains composed outwardly, while anger grows within.

She kept her smile, but inside, she did a slow burn over the unfair criticism.
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