In reply to indicating elision on the web:
The undertie is used in IPA phonetic transcription to indicate the “absence of a break”. That means that there isn’t the usual tiny pause between words that would otherwise be expected. Aert Kuipers and a few of his European students used it to indicate clitics in Salishan languages, whereas nowadays most people use the equals sign instead: s‿qał versus s=qał, both pronounced like [sqaɬ] and not [s qaɬ]. (I made this example up for illustrative purposes.) Clitics are elements that are word-like but not entirely independent words, usually because they can’t be said alone. English examples are the ’s for possessives like Phillip and Edwin and Alfred’s apartment and the n’t for negation like don’t ‘do not’ and couldn’t ‘could not’. There’s also the ’d for the ‘would’ clitic and ’ve for the ‘have’ clitic, e.g. I’dn’t’ve ‘I would not have’. All of these could be represented with the undertie in transcription, so /... ʔænd ˈʔæl.fɹɛd‿z .../, /ˈkʊd‿n̩t/, and /ˈʔai̯‿d‿n̩t‿əv/.
I don’t know much about Latin poetry, but I suspect that the IPA symbol probably derives from the Latin academic tradition. Hence it’d be appropriate to return it to its Latin-usage roots.
