Tesón (en. Tenacity)
/te'son/
Slang Meanings
To be very committed to something.
Andrés is fully into his project; he's in tenacity mode.
Andrés está a full con su proyecto, está en modo teso.
To insist on an idea despite opposition.
She always goes all in until she convinces others.
Ella siempre va a teso hasta que convence a los demás.