If/when push comes to shove spoken language
When/if no other choice is available; when/if the situation develops in a more or the most unpleasant way; when/if drastic measures are required.
We should come back when you arrive, but if push comes to shove, the neighbor living next door has a spare key that allows you to get into the house.
The study comes to a conclúion that if push comes to shove, there might record 100,000 cases of the disease tomorrow.
This phrase originated in African-American English around the middle of the twentieth century.
Confusion made worse than before.
There was heavy traffic on the way to work this morning. Confusion worse confounded when some drivers were arguing with each other right in the middle of the street.