A typical combination of two words or more that has a special meaning independent from the meaning of the words taken separately.
To collocate: to place together
Form
There are many forms but the most common ones are:
– adjective + noun
– verb + noun
– verb + adjecive
– noun + noun
Examples:
–Do a job
– make a promise
– set objectives
– think big
– passive smoking
– objectives setting
– lay out a goal
Note:
This kind of expressions is vital in our daily verbal and written communication. They are sometimes confusing and they can be acquired by readind and practice.