Portcullis
/pɔːrtˈkʌlɪs/
Definition 1 of 1
Pro Tip 1/3Medieval Origin
Originates from medieval fortifications; think castles and historical battles. 
The tour guide explained how the portcullis was used during sieges in the Middle Ages.
Pro Tip 2/3Security Symbol
Symbolizes security and defense, often used metaphorically in this sense. 
She guarded her secrets like a castle with a portcullis.
Pro Tip 3/3Heavy and Sturdy
Implies heaviness and sturdiness, different from ordinary gates. 
The ancient portcullis was so hefty, it took ten men to lift it.