Subordinate clause:
Containing both a subject and a verb, but unlike the independent clause, unable to stand alone; it does not express a complete thought.

Example
"Man, when you lose your laugh, you lose your footing."
(Ken Kesey)

Explanation:

There is not much to explain for this term. Subordinate clauses mainly serve as a easy way to connect a verb and a subject swiftly and easily. This adds suspense in some situations because the thought is generally incomplete.