ὑποτειχίζειν

From LSJ

πάτερ, ἄφες αὐτοῖς, οὐ γὰρ οἴδασιν τί ποιοῦσιν → father, forgive them, for they know not what they do

Source

Greek > English (Woodhouse Verbs Reversed)

(see also ὑποτειχίζω): build an intercepting wall, build an intersecting wall

Lexicon Thucydideum

murum substruere, to build a wall beneath, 6.99.2.