Do not bring them together. Palm concave means to make the palm heart empty and hollow.

指分是将五指分开，不要并拢，掌凹是使掌心向里涵空凹拢；

youdao

I wasn't happy because my heart was empty.

我不快乐，因为我的内心是空虚的。

youdao

You listen with only one purpose: to help him or her to empty his heart.

你倾听只为一个目的：帮助他或他清空心灵的负担。

youdao

" The show's best moments exposed the essence of Nico's compositions: The excellent Joan Wasser, who performs as Joan as Police Woman, tapped the raw anguish in "My Heart Is Empty" and "Ari's Song, " while Jonathan Donahue of Mercury Rev delivered with muted joy the stark poetic imagery of "Evening of Light.

WSJ: John Cale | Collision Course | By Jim Fusilli

But the scheme has been so successful that many beds earmarked for heart patients are now lying empty.

BBC: Bid to clear NHS heart op waits

And to have lost Billy, you know, it's really going to be an empty space in my heart.

NPR: Gospel Singer Andrae Crouch: 'Mighty Wind'