ὑποσυρίζω → make a shrill piping sound, hiss (as of serpents)

[telned]

υποσυρίζει

ὑποσυρίζω → make a shrill piping sound, hiss (as of serpents) [ὑπό, "under," "below" + συριγμός, "hissing"]

[vmelas]

υποσυρίζει

Within the thread you quote the answer can be found. In one of the replies I see this:

From Liddell-Scott-Jones' Greek Lexicon:
ὑποσῡρ-ίζω, Att. ὑποσῡρ-ίττω,
whistle, rustle ...
The verb is based on ὑπό, "under," "below" + συριγμός, "shrill piping sound," "hissing" (as of serpents).  So it's actually somewhat onomatopoetic.

Does that answer your question?

[telned]

Yes, thank you, it does answer my question.