Guard - according to the Tangyun: the sound of 鐔 (MC ziɪm, jiɪm, dʌm) has the same pronunciation as 尋 (MC ziɪm), another being 潭 (MC dʌm).

“Ue o Muite Arukō”Walk Looking Up

Shinkansen no kōkakyō o aruku rēruwōku ga kaisai saretaa walk was held across the Shinkansen viaduct