ὑποσιδηρόω
From LSJ
ἐφ' ἁρμαμαξῶν μαλθακῶς κατακείμενοι → reclining softly on litters, reclining luxuriously in covered carriages
English (LSJ)
in pf. part. Pass., δακτύλιοι χρυσοῖ ὑποσσεσιδηρωμένοι, i.e. iron rings gilded, Inscr.Délos399B14 (ii B. C.).