keep something in mind—remember and think about smth.; not forget smth:
- We have no vacancies now, but we’ll certainly keep your application in mind.
Note: The expression is not equivalent in meaning to the phrase keep one’s mind on something—(also: have one’s mind on something) continue to pay attention to smth.; not be distracted from smth.:
- She merely sat very still while he attended to the interview he could no longer keep his mind on.
keep something in one’s head—be able to retain in memory smth. such as facts, figures, etc.:
- I don’t know how the chairman keeps all these data in his head.