Hold on and Stand firm

Hold on verb - To remain indefinitely in existence or in the same state.

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

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

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