Caer has several idiomatic uses:

• Este vestido le cae bien.
  This dress fits her well.

• Caer en gracia.
  To fall into the good graces of one.

• La puerta cae á oriente.
  The door is on the east side.

• Ya caigo, ya caigo en ello.
  Now I understand.

• Caerse redondo.
  To fall flat.

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