Is "on" necessary in "head on out"? It seems to be okay by just saying "head out."
Native speaker’s answer
Rebecca
No, "on" is not necessary to use and you can just say "head out" in this context. The preposition "on" is just used here to give a sense of urgency or to indicate that the action should happen immediately. However, this is only a slight difference in nuance and it would not change the overall meaning if you omit "on".