LogeionPerseus analysis of ὑπέδεισαν:
ὑποδείδω (shrink in fear under, cower before): aor ind act 3rd pl
LSJ entry
ὑποδείδω
ὑποδείδω,
I. trans., shrink in fear under, cower before, c. acc., Hom.,
who uses mostly the aor. (usu. written with double δ for δϝ, v. δείδω) , ὑπέδδεισαν, ὑποδδείσαντες, Il. 1.406,
12.413,
al.; ὑποδείσατε Od. 2.66:
Ep. pf. 2
and plpf.,
ὑποδείδια 17.564,
Philet. 8,
ὑπεδείδισαν Il. 5.521:
Ep. pf. 1
ὑπαιδείδοικα h.Merc. 165:
literally, of birds, cower beneath, μέγαν αἰγυπιὸν ὑποδείσαντες S. Aj. 169 (anap.).