open heart
open (your) heart
to show or tell your true feelings and thoughts.
It is easier to open my heart to Dad in a letter than to speak to him face to face.

[TahlilGaran] English Idioms Dictionary ▲

open heart
n.
1. No hiding of your feelings; frankness; freedom.
She spoke with an open heart of her warm feelings for her pupils.
She told her troubles with an open heart.
Compare: HEART ON ONE'S SLEEVE.
2. Kindness; generosity.
She contributed to the fund with an open heart.
Mr. Jones has an open heart for underprivileged children.
Compare: OPEN ONE'S HEART.

[TahlilGaran] English Idioms Dictionary ▲

open one's heart
v. phr.
1. To talk about your feelings honestly; confide in someone.
After going around worrying, Mary opened her heart to her mother.
John felt much better after he opened his heart to Betty.
2. To be sympathetic to; give love or help generously.
Mrs. Smith opened her heart to the poor little boy.
After the moving speech by the UN official, the people opened their hearts to the poor people of India.
Compare: OPEN HEART, WEAR ONE'S HEART ON ONE'S SLEEVE.

[TahlilGaran] English Idioms Dictionary ▲