apodosis protasis vs apodosis apokoinu [Grk apó koinoũ ‘from what is in common’]

Syntactic construction in which two sentences share a common element that can be either in the second sentence or on the border between the two sentences. Apokoinu refers to both sentences grammatically and syntactically, cf. This is the sword killed him. It is debatable whether or not so-called contact clauses such as There is a man below wants to speak to you are instances of apokoinu or not (see Jespersen 1927).