checkup /ˈt͡ʃɛkʌp/noun 2forms 1phrases 1 noun2 •A routine visit to the doctor, dentist, or the like.The appointment was just for a checkup. •A routine inspection.I took my car in for an annual checkup. formscheckups Phrases with checkup checkup from the neck upThe analysis of one's own thoughts or beliefs with a view to reforming oneself.