What is an antonym for the word deadlock?

There isn't a single perfect antonym for "deadlock" as its meaning depends on context. However, here are some words that could work depending on the situation:

For situations of impasse or stalemate:

* Resolution

* Agreement

* Compromise

* Breakthrough

* Progress

For situations of a mechanical lock:

* Unlock

* Open

* Release

* Free

For situations of a standstill:

* Movement

* Activity

* Progression

* Advancement

It's important to consider the specific context of "deadlock" to choose the most appropriate antonym.