summon up

US /ˈsʌm.ən ʌp/
UK /ˈsʌm.ən ʌp/
"summon up" picture
1.

to gather or evoke (a quality, feeling, or response) from within oneself

:
She tried to summon up the courage to speak.
He couldn't summon up any enthusiasm for the task.
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.