eu ‧ phe ‧ mis ‧ m /ˈjuːfəmɪz ə m, ˈjuːfɪmɪz ə m/ BrE AmE noun [countable]
[ Date: 1500-1600 ; Language: Greek ; Origin: euphemismos , from euphemos 'sounding good' , from pheme 'speech' ]
a polite word or expression that you use instead of a more direct one to avoid shocking or upsetting someone:
‘Pass away’ is a euphemism for ‘die’.