ruminate

Imagine a cow chewing its cud, going over the same mouthful again and again. That image helps explain this word. It means to think deeply about something and keep turning it over in your mind. You might do this with a hard decision, an important talk, or a mistake you cannot stop replaying. The word can be neutral, but it is often used when someone stays on the same thoughts for too long, especially sad, worried, or troubling ones.

To ruminate means to think deeply and repeatedly about something, often for a long time. It is more than a passing thought. It suggests going back to the same idea again and again, as if your mind were slowly re-chewing it. Sometimes this kind of thinking is careful and useful, such as when someone is weighing a big choice. At other times, it becomes stuck and unhelpful, especially when the thoughts are about regret, worry, or pain.

You might ruminate on a problem while trying to find the best answer. "She ruminated for hours about whether to accept the job offer." You can also ruminate over something painful. "He spent days ruminating over his mistake, unable to move forward." In everyday English, this second use is very common, so the word often carries a feeling of being trapped in your own thoughts.

There is also a literal meaning. A cow or similar animal can ruminate by chewing its cud. That physical action is where the mental meaning comes from. Because of that link, the word gives a strong picture: the mind keeps coming back to the same thought, working on it over and over. So in most modern contexts, to ruminate is to think for a long time in a repeated way, often so much that it becomes hard to let the thought go.