Keep on and Stand firm

Keep on verb - Allow to remain in a place or position or maintain a property or feature.

Stand firm and keep on are semantically related in keep at topic. In some cases you can use "Stand firm" instead a verb "Keep on".

Stand firm verb - Stand up or offer resistance to somebody or something.

Keep on and stand firm are semantically related in keep at topic. You can use "Keep on" instead a verb phrase "Stand firm".