The word "collins" can refer to two different things in English, and I'll explain both meanings for you.
Definition: A "collins" is a type of tall, refreshing drink that usually contains gin, lemon juice, sugar, and soda water. It is served over ice in a tall glass.
Definition: Collins refers to Wilkie Collins, an English writer known for his early detective novels. He lived from 1824 to 1889 and is famous for works like "The Woman in White" and "The Moonstone."
There are no specific idioms or phrasal verbs that include "collins," but you might hear phrases like "mix a drink" when talking about making a collins.