different between untuck vs unluck

English

un- +? tuck

untuck (third-person singular simple present untucks, present participle untucking, simple past and past participle untucked)

(transitive) To remove something from a relatively hidden location or position where it is tucked.
As soon as work is over, I'm going to untuck this shirt and take off my shoes.
The cat will wake up in a tightly curled position, then untuck her head, and gradually her limbs, and then stretch.
(LGBT, of a drag queen, trans woman, etc.) To remove that which is concealing one’s penis and testicles such as gaff or adhesive tape.

From un- +? luck.

unluck (uncountable)

Absence or lack of luck; lucklessness; bad luck; misfortune.
- 2004, Sonny Brewer, Stories from the Blue Moon Cafe III:
  Truly the unluck had been visited upon him.
- 2010, Suzanne Werner, Snapshots:
  With a look of amusement on your face you ask me if I believe in luck. I fumble around for an answer, but the question stays with me as I venture out into the chill of the afternoon. It's not luck I believe in, but unluck. I have seen unluck in many guises.

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