sub specie mortis
/sʌb ˈspiːʃiː ˌmɔːtɪs/ /sʌb ˈspiːʃi ˌmɔːtɪs/adverb
With awareness of one's mortality; in the face of death.
Origin
Early 20th century; earliest use found in The Living Age. From post-classical Latin sub specie mortis from classical Latin sub + speciē, ablative of speciēs + mortis, genitive of mors.