However, "for" is used in many common idioms, which give it specific meanings within those phrases. Here are a few examples:
Idioms with "for":
* For all intents and purposes: This means "effectively" or "in every practical sense."
* For the time being: This means "temporarily" or "until something else happens."
* For good measure: This means "to be extra cautious" or "to make sure something is done thoroughly."
* For crying out loud: This is an exclamation of frustration or disbelief.
* For once: This means "on this one occasion" or "for the first time."
* For sure: This means "definitely" or "without a doubt."
* For the birds: This means "unappealing" or "worthless."
* For the record: This means "to officially state something."
To understand the meaning of "for" in a specific context, you need to consider the entire idiom.
If you can provide an example of how "for" is used in a sentence, I can help you understand its meaning.