To erect or raise together with another; to construct or build jointly.
From co- (together) + erect (to raise, build), from Latin erigere. This is a rare compound verb, combining the prefix co- meaning 'jointly' with the common verb erect.
This is an extremely rare word that most English speakers have never encountered—it means to build something together with someone else. While perfectly logical as a word formation, English speakers prefer just 'erect' and use 'together' as a separate word rather than embedding it in the verb.
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