ὑπόβαθ-ρον · hypobath-ron — LSJ
anything put under, a base
anything put under, a base:
1 footstool
footstool, Thphr. HP 5.7.6, App. Pun. 111, D.L. 1.94; ὑ. νυμφικά IG 2(2).1485.54.
2 a wooden framework, rocking apparatus
a wooden framework to support a couch, a kind of rocking apparatus, X. Mem. 2.1.30, Antyll. ap. Orib. 6.23.3, Anon. ap. Stob. 4.31.84.
3 keel
keel of a ship, prob. for ὑποβάραθρον in Gal. 19.169.
4 step
step, διʼ ὑποβάθρων Lyd. Mag. 2.11, 3.41.