blocker
nounUK /ˈblɒk.ər/
US /ˈblɑː.kɚ/
A blocker is something that stops things from going past it.
The big rock was a blocker on the path, so we could not walk through.
OTHER MEANINGS
2. In sports, a blocker is a player who stops an opponent from moving forward.
The blocker protected the runner so the team could score.
3. A blocker is a medicine or substance that stops a certain body process.
The doctor gave him a beta blocker to help his heart.
4. A blocker is a person or thing that prevents something from happening.
The rain was a blocker for our picnic plans.