summon up
US /ˈsʌm.ən ʌp/
UK /ˈsʌm.ən ʌp/

1.
2.
to cause something to appear or be available, especially with effort or difficulty
:
•
He managed to summon up a smile despite his pain.
•
The magician tried to summon up a spirit.
to cause something to appear or be available, especially with effort or difficulty