From the NASB open the context menu for James 5:5 and the metaphor "Fattened your hearts".
Select in the left side of the context menu-"fatten animal for slaughter figurative language type"
Open the "Lexham figurative Language Bible Glossary" from the right side of the Context Menu
Select the link "Heart" under "Reference Works" for "The Lexham Bible Dictionary" and open it
Note it opens to the title page and the word "Heart" is not in that resource
See screenshot below.