Blocker — A blocker is an issue that prevents work from progressing.

In plain English

A blocker is anything that stops you from moving forward.
Missing input, missing access, missing decision — doesn’t matter

If it’s a blocker, work is stuck.

What they actually mean

Blockers are rarely technical.
They’re usually:

someone else’s decision

someone else’s priority

or something no one wants to own

Calling something a blocker is often the only polite way to say
“I can’t move until someone else does their job.”

Example

Does it actually matter?

✅ Yes — immediately.
Unresolved blockers kill momentum and hide delays behind “progress”.

✅ Healthy teams surface blockers early.
⚠️ Unhealthy ones work around them until things break.