The response for the girl on brink, when her roommate arrived with coffee, is On the verge of doing something or having something happen, particularly something bad or disastrous.
Who are roommates?
Roommates are the person who live with you in your room or flat, then they will be known as flatmates.
Usually, when we live in other cities to work or studies, students or workers live with roommates to save their rent.
Thus, On the verge of doing something or having something happen, particularly something bad or disastrous, is the meaning of brink.
Learn more about roommates
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