to prepare or make by combining ingredients, especially in cookery: to concoct a meal from leftovers.
2.
to devise; make up; contrive: to concoct an excuse.
Origin: 1525–35; < Latinconcoctus (past participle of concoquere to cook together), equivalent to con-con- + coc-, variant stem of coquere to boil, cook1 (akin to Greekpéptein; see pepsin, peptic) + -tus past participle ending
1530s, 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.