You could see him sizzle with anger when the boss rejected his proposal.

sizzle 是动词，本意是"发出嘶嘶声"，常用来形容食物在煎炸时发出的声音。在这里用作比喻，形容人愤怒时像热油一样"冒火"的状态，生动地表现出强烈的愤怒情绪。