Step 1: Understanding the context.
The passage describes a situation where a man hits his thumb-nails with a hammer and curses. Language, in this case, serves to express his pain or frustration. The use of curses helps relieve the man's feeling of distress.
Step 2: Function of language.
Language provides an outlet for the man's emotions, allowing him to vent his feelings. This use of language doesn't require an audience but serves to alleviate his discomfort and frustration.
Step 3: Conclusion.
Thus, language helps relieve the man by providing a means for him to express his emotional reaction to pain.
Final Answer: \[ \boxed{\text{Language helps relieve the man by allowing him to express his emotional reaction to pain through curses.}} \]