godan verb (-su), transitive verb
ponder; turn over in one's mind; recall and reflect on
To think deeply about something, often by recalling past events or possibilities and examining them from different angles. Slightly literary or introspective.
彼は昔のことを思い回しながら、窓の外を眺めていた。
He was gazing out the window, turning over memories of the past in his mind.
失敗の原因を一人で思い回す。
I ponder the cause of my failure alone.