In this image, you can see that by default WooCommerce display’s short description of the product. But what if your business requires a long description instead. Now let’s look into the simple snippet that may help you to do so.
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Just give it a try to replace your product’s short description with a long description. Simply add this to your function.php file in the child theme.
remove_action('woocommerce_single_product_summary','woocommerce_template_single_excerpt', 20);
add_action('woocommerce_single_product_summary', 'the_content', 20);
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Been looking for this code for weeks. Live saver!! Thanks so much