to prepare or make by combining ingredients, esp. in cookery: to concoct a meal from leftovers.
2.
to devise; make up; contrive: to concoct an excuse.
Origin: 1525–35; < L concoctus (ptp. of concoquere to cook together), equiv. to con-con-+ coc-, var. s. of coquere to boil, cook1(akin to Gk péptein;see pepsin, peptic) + -tus ptp. ending
To devise, using skill and intelligence; contrive: concoct a mystery story.
[Latin concoquere, concoct-, to boil together : com-, com- + coquere, to cook; see pekw- in Indo-European roots.] con·coct'er, con·coc'tor n., con·coc'tion n., con·coc'tive adj.
1533, from L. concoctus, pp. of concoquere "to boil together, prepare," from com- "together" + coquere "to cook" (see cook (n.)). First expanded metaphorically beyond cooking 1792.