have a one-track mind

have a one-track mind

Fig. to think entirely or almost entirely about one subject. Adolescent boys often have one-track minds. All they're interested in is the opposite sex. Bob has a one-track mind. He can only talk about football.
See also: have, mind

have a one-track mind

if someone has a one-track mind, they seem to talk and think about one particular subject all the time, especially sex 'I bet I know what you two were doing last night.' 'Oh, shut up, Sean, you've got a one-track mind.' You've got to have a one-track mind if you want to succeed in business.
See also: have, mind