1. thinking deeply and repeatedly about something, especially something troubling or problematic
Usage: present participle of ruminate
2. chewing cud (of ruminant animals like cows or sheep)
Usage: biological/zoological sense

Examples

• She spent hours ruminating about her failed job interview.
• Stop ruminating over past mistakes and focus on the future.
• He was ruminating on the difficult decision he had to make.
• The therapist helped her stop ruminating about negative thoughts.
• The cow was peacefully ruminating in the pasture.
• Sheep spend much of their day ruminating after grazing.