• to keep sy's memory green
• custody, safekeeping, surveillance, trust
• to be on one's guard, to shun, to stand on one's guard
• to seize sy, to take sy in charge, to take sy into custody
• to preserve, to retain, to safeguard
• to audit, to check, to check up, to control, to follow up, to inspect, to monitor, to oversee, oversaw, overseen, to sift, to stand over, to superintend, to supervise, to survey, to tally, to test, to try, to verify, to vet