a mystery to (one)

a mystery to (one)

Something that is difficult to understand. Why she walked out in such a huff this morning is a mystery to me! She was acting normally before that. It was a mystery to scientists where the birds migrated to until they banded some of them and tracked their movement.
See also: mystery
Farlex Dictionary of Idioms.
See also:
  • a shoulder to cry on
  • appear to
  • able to do
  • able to do it
  • a change of heart
  • be (on) the wrong side of (an age)
  • be on the right/wrong side of 40, 50, etc.
  • (one) can whistle for it
  • a turn of phrase
  • a piece of the action