In the past two weeks, that crisis went from slow burn to raging fire.
"Not much," replied Bolton, the slow burn of disdain threatening to go on the boil.
The Americans has given us both a chilly pleasure and a slow burn in the proximity of its antagonists.
Quincy described his show as a “slow burn” with a “nice, melancholy sweetness to it like Charlie Brown.”
The blows were weak, for I was still dazed; but they served, together with the slow burn of my anger, greatly to steady me.
To waste time; to start to lose momentum or interest in a project: sloughing off on the homework