The heart muscle solidifies into a hard rock that refuses to shrink or tremble inside the chest. It pushes steadily outward to physically meet whatever stands in front of it.
Example Usage
Thai: เขาใจกล้าจับงูด้วยมือเปล่า
Transliteration: káo jai glâa jàp nguu dûai muue bplàao
Translation: He was brave enough to catch the snake with his bare hands.