sentry, s.1a(Guard) Fairtheoir m. To relieve a sentry, uainíocht a dhéanamh ar fhairtheoir. b(Outpost) Post m fairtheoireachta. 2To stand sentry; to be on sentry (-go), dul ar garda; bheith ar garda. To force a sentry, gabháil le foréigean thar an ngarda.