secretskill
nounUK /ˈsiː.krət.skɪl/
US /ˈsiː.krət.skɪl/
A special thing you are good at that you keep hidden from others.
Her secretskill is solving puzzles faster than anyone in class.
OTHER MEANINGS
2. A clever move or trick used only in special situations.
He pulled out a secretskill to fix the broken toy.
3. A skill you practice alone so no one sees you learning it.
She learned a secretskill at home and surprised everyone at the show.
4. A hidden way to win a game that other players do not know.
His secretskill helped him win the card game every time.