lest we forget /lɛst wi fə(ɹ)ˈɡɛt/ exclamation3 •Used in ceremonies and memorials as a caution against forgetting those who died in war. •(UK, Canada) Used in Remembrance Day ceremonies as a caution against forgetting those who died in war. •(Australia, New-Zealand) Used on Anzac Day memorials as a caution against forgetting those who died in World War I.