throw open phrasal verb

1. to allow people to enter or visit a place where they could not go before
2. to allow people to discuss something, take part in a competition, etc.
   • ● The debate will be thrown open to the audience.
   • ● The organizers are throwing the contest open to under 21s for the first time.

[TahlilGaran] English Dictionary ▲

throw open
1. To open wide with a sudden or strong movement.
He dashed in and threw open the windows.
2. To remove limits from.
The Homestead Act threw open the West.
When a hurricane and flood left many people homeless, public buildings were thrown open to shelter them.

[TahlilGaran] English Idioms Dictionary ▲