To display utmost loyalty and devotion; to be wholeheartedly faithful and sincere, holding nothing back.
他对公司的新项目总是披肝挂胆，贡献了自己所有的智慧和力量，确保了项目的顺利完成。
He always approached the company's new project with utmost dedication and loyalty, contributing all his wisdom and strength, ensuring its smooth completion.
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