This is the 8565th most frequent Spanish word.
rumián
"Rumián" refers to a type of wild rose or dog rose.
Here, 'rumiar' indicates the act of chewing food repeatedly, as it often happens with herbivorous animals.
Los caballos rumiaban tranquilamente en el establo.
The horses were chewing calmly in the stable.
The usage of 'rumiar' in this sentence is metaphorical, signifying thinking deeply or mulling over thoughts or ideas.
Rumiaré las ideas antes de tomar una decisión final.
I will mull over the ideas before making a final decision.
This sentence uses 'rumiar' in an emotional or psychological sense, to mean dwelling on or revisiting certain thoughts repeatedly.