Direct Opposites:
* Retain: This means to keep something, the opposite of replacing it.
* Keep: Similar to "retain," this implies not replacing something.
* Restore: This means to bring something back to its original state, effectively reversing a replacement.
Other Options:
* Repair: If you're replacing a broken item, repairing it is the opposite.
* Leave: If you're replacing something with another, you could say you're leaving the old one behind.
* Remove: This is the opposite of putting something in place, which is often a part of replacing.
Example:
* "You need to replace the broken chair."
* Opposite: "You should retain/keep the broken chair." (Instead of replacing it)
* Opposite: "You should repair the broken chair." (Instead of replacing it)
To give you the most accurate opposite, please provide more context about how "replace" is being used.