I thought I could use muse like this:
I must have been musing for too long because my stomach began to groan.
But it doesn't seem to be the right usage.
What's a better word? (To avoid writing "... been musing on these thoughts ...)
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To brood conveys the meaning you looking for:
- to think for a long time about things that make you sad, worried, or angry: I wish she wouldn't sit brooding in her room all day.
- (formal) to think carefully and for a long period about something: She ruminated for weeks about whether to tell him or not.