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.

• let go of
• let go of someone
• let go of something
• let hair down
• let have it
• let heart rule head
• let heart rule your head
• let her rip
• let in on
• take something by the throat
• take something for granted
• take something in good part
• take something in hand
• take something in stride
• take something into account
• take something into own hands
• take something into your own hands
• take something in your stride
• take something lying down
• take something off
• take something off hands
• take something off someone's hands
• take something on faith
• take something out
• take something out on