brood over something
collocation为某事忧思；对某事耿耿于怀
Stop brooding over your past mistakes.
别再为你过去的错误忧思了。
沉思；忧思；郁闷地思考
brooding — present participle of brood
孵（蛋）；孵雏；抚育；培养；呵护；繁殖；被培育；孵蛋使其孵化。；保护(逐渐成熟的事物)；培育。
to think about something sadly, angrily, or moodily for a long time
常与 over、on 或 about 连用
孵蛋使其孵化。
To keep an egg warm to make it hatch.
保护(逐渐成熟的事物)；培育。
To protect (something that is gradually maturing); to foster.
(通常与 over、on 或 about 连用)独自长时间沉思、忧虑。
(typically with over, on or about) To dwell upon one's thoughts moodily and at length, mainly alone.
被繁殖。
To be bred.
一般现在时
She broods over her mistakes for days.
她好几天都在沉思自己的错误。
present progressive
The hen is brooding her eggs.
母鸡正在孵蛋。
一般过去时
He brooded about the problem all night.
他整夜都在焦虑地思考那个问题。
规则动词，过去式和过去分词加-ed。
After the argument, she sat alone in her room brooding over what had been said.
争吵之后，她独自坐在房间里沉思着说过的话。
用法提示：此处 brooding 为现在分词，表示“沉思”，常与 over 连用。
He tends to brood about his mistakes long after they are made.
他倾向于在犯错后长时间耿耿于怀。
用法提示：brood 作为动词原形，与 about 搭配，表示“忧虑”。
Stop brooding and come help us with the preparations.
别发愁了，来帮我们准备吧。
用法提示：brooding 为动名词，用于祈使句否定形式，表示“担忧”。
worry 常用于日常烦恼，不强调独处或长时间；brood 更侧重独自郁闷地反复思考。
fret 多指为小事烦躁不安，程度较轻；brood 则更深沉、持续时间更长。
mope 强调因不开心而消沉，不一定在思考某事；brood 常指反复琢磨某个念头或问题。
agonize 语气更强，多因重大抉择或难题而痛苦纠结；brood 更内敛，未必有强烈情绪。
ruminate 较正式，可中性指仔细思考；brood 一般带消极、忧郁的意味。
针对“独自郁闷地沉思、担忧”义；指摆脱低沉情绪。此反义不适用于“孵蛋/培育”义。
针对“反复苦想”义；指主动把烦恼或念头放下。注意该义下的 brood 是不及物动词，常与 over/on/about 连用，而 dismiss 是及物动词。
为某事忧思；对某事耿耿于怀
Stop brooding over your past mistakes.
别再为你过去的错误忧思了。
默默地忧思；独自闷闷不乐
He sat in the corner, brooding in silence.
他坐在角落里，默默忧思。
孵蛋的母鸡；抱窝的母鸡
The brooding hen refuses to leave her eggs.
孵蛋的母鸡不肯离开她的蛋。
反复忧思；为……而闷闷不乐
She sat by the window, brooding over what he had said.
她坐在窗边，反复想着他说过的话。
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Dictionary facts from ECDICT, OCTANOVE, WIKTIONARY, WORDNET.