An Ancient Greek expression of sorrow, especially mixed with anger, is “popoi”. The “p” sound must have been evocative of these emotions. Here Achilles is mourning Patroclus in the last line every word has a “p” in it. (Pieiras perthonte poleis meropon anthropon) expressing Achilles sorrow at the death of his best friend.
τόφρα δέ μοι παρὰ νηυσὶ κορωνίσι κείσεαι αὔτως,
ἀμφὶ δὲ σὲ Τρῳαὶ καὶ Δαρδανίδες βαθύκολποι
κλαύσονται νύκτάς τε καὶ ἤματα δάκρυ χέουσαι,
τὰς αὐτοὶ καμόμεσθα βίηφί τε δουρί τε μακρῷ
πιείρας πέρθοντε πόλεις μερόπων ἀνθρώπων.
so long will you lie just as you are beside beaked ships, and around you the Trojan. women and the Dardanian women with their deep bosoms will weep day and night pouring out their tears, the women we won by force and the long spear when we sacked the rich cities of mortal men.