The phenomenon is the word often appears from 2 or more words together as in the use of language. In this meaning, the term is used as an uncountable noun collocation.
Phenomenon since the two words often appear together, as the popularity of the language. In this sense, the collocation is used as an uncountable noun.
The phenomenon that establishing word but 2 word up! Often appear together according to popularity in the use of language. In this meaning, the word collocation is used as a uncountable noun.