To raise one's hand to one's forehead in a gesture of great relief or gladness; to feel extremely thankful for a fortunate outcome.
得知项目顺利完成，团队成员们都额首称庆，心中一块大石终于落下
Upon learning that the project was successfully completed, the team members all expressed great relief and joy, feeling as if a huge weight had been lifted from their shoulders.
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