portcullis

/pɔːtˈkʌlɪs/

meaning in plain English

A heavy iron or wooden gate with bars that slides down to block a castle entrance.

Imagine a portcullis dropping like a steel net to trap invading knights at a castle gate.

for example

The guards quickly lowered the portcullis to stop the enemy from entering the castle.

Imagine standing at the gate of a medieval castle, watching that heavy iron portcullis slam down with a thunderous clang—suddenly, the drawbridge isn’t just a bridge anymore, it’s a useless plank because the portcullis has turned the entrance into a fortress. You’d think twice about charging in when that spiked barrier drops like a guillotine, sealing the fate of any intruder.