The Collaborative International Dictionary
Synchoresis
Synchoresis \Syn`cho*re"sis\, n. [NL., fr. Gr. ?; sy`n with + ? a going.] (Rhet.) A concession made for the purpose of retorting with greater force.
Wiktionary
synchoresis
n. (context rhetoric English) A concession made for the purpose of retorting with greater force.