heart and soul
US /hɑːrt ənd soʊl/
UK /hɑːrt ənd soʊl/

1.
心血を注いで, 全身全霊で, 完全に
with all of one's energy and dedication; completely
:
•
She put her heart and soul into her painting.
彼女は絵に心血を注いだ。
•
He devoted his heart and soul to the project.
彼はそのプロジェクトに心血を注いだ。