ὑπαί (hypai)
ὑπαί is an Ancient Greek form of ὑπό, meaning “under, by (+gen./dat./acc.)”. It is the preposition.
Found 40 times in the Ancient Greek texts on Socratos.
Where it is used
Apollonius Rhodius, Argonautica 1.538: στησάμενοι, φόρμιγγος ὑπαὶ περὶ βωμὸν ὁμαρτῇ
Euripides, Electra 1188: παθοῦσα σῶν τέκνων ὑπαί.
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Liddell-Scott-Jones, A Greek-English Lexicon (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.