· come up with (an idea, plan, explanation, theory, or principle) after a mental effort; "excogitate a way to measure the speed of light"
Synonym(s): contrive, devise, excogitate, formulate, forge
Hypernym(s): create_by_mental_act, create_mentally
· concoct something artificial or untrue
Synonym(s): fabricate, manufacture, cook_up, make_up
Hypernym(s): think_up, think_of, dream_up, hatch, concoct