carry something in your head/mind
From Longman Dictionary of Contemporary Englishcarry something in your head/mindcarry something in your head/mindREMEMBERto remember information that you need, without writing it down Alice carried a map of the London Underground in her head. → carryExamples from the Corpuscarry something in your head/mind• He must remember the word and carry it in his head for some time, and so is writing from an image.• The amount of knowledge Lee carries in her head is amazing.