Add product description on shop page

functions.php

add_action( 'woocommerce_after_shop_loop_item_title', 'dt_woocommerce_product_excerpt', 35, 2); 
 
function dt_woocommerce_product_excerpt()  
{ 
	echo '<span class="excerpt">'; 
	the_excerpt(); 
	echo '</span>'; 
} 

Try this code in functions.php