(idiomatic) To clearly understand one's own feelings, intentions, preferences, etc; to know precisely what one wants; to be decisive or determined.

One should put one's mental faculties to good use.

(simile) A remarkably efficient mind; great skill in learning and/or reasoning.

plural of mind like a steel trap

Contentment is more a matter of attitude than circumstances.

(idiomatic, dated) A phrase used at parting.

The plant Soleirolia soleirolii, baby's tears.

(transitive) To avoid thinking about something.

Alternative form of mind one's ps and qs

Alternative form of out of sight, out of mind