転 roll over

The car rolled over the twin cows TEN times, decapitating them.

bicycle ★★★★★
自 (my own) + 転 (roll over) + 車 (car) = 自転車 (bicycle)

drive a vehicle ★★★★☆
運 (carry / luck) + 転 (roll over) = 運転 (drive a vehicle)

do an about-face ★★★☆☆ CCW
転 (roll over) + 向 (turn to face) = 転向 (do an about-face)

convert to new ideology, do an about-face. This is important because most of the freaky looking kids you see on the street will all become housewives and salarimen the exact second they turn ２3. - making TENKOU what we call a "cultural code word."

transfer ☆☆☆☆☆
転 (roll over) + 勤 (be employed at) = 転勤 (transfer)

when a salariman gets transferred to another office, that's tenkin.

I only mention this because most of the Japanese you meet who speak good English, probably one of their parents got tenkin-ed to America / UK, so it tends to come up in conversation.