트다

clear; open

Explanation

1. clear; open
To remove blocking objects and make the part passable.

2. open
To open a market, etc.

3. get acquainted
To start a friendship with someone, neither mutually cautious nor shy.

4. start business with
To form a relationship with someone with whom one trades things mutually.

5. speak casually to
To become close to someone and to be able to speak casually.

Examples
가운데를 트다
길을 트다
뒤를 트다

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