The belief or ideology that to die in battle for one's country is glorious or noble.
‘It is sweet and fitting to die for one's country.’ Used to assert (now frequently ironically) that to give one's life in this way is glorious or noble.
Early 19th century; earliest use found in Lion. Short for classical Latin dulce et decōrum est prō patriā morī, lit. ‘it is sweet and fitting to die for one's country’ (Horace's Odes 3. 2. 13) from dulce, neuter of dulcis sweet + et and + decōrum, neuter of decōrus fitting + est, 3rd singular present indicative of esse to be + prō on behalf of + patriā, ablative of patria + morī to die.