Depends on the context. Usually its a way of telling someone to go out and do something enthusiastically.
Not exactly back and forth. To commute something means "change something for another thing" so commutative means that it can be commuted.
forth-go forth and spread the word
This is how you spell the number 4: four. You should always write out this number as a word if you plan to use it at the beginning of a sentence, such as, "Four hours have passed since sundown!"
that means reflections
well maybe be it's the suffix -ceed, because when you look at the word proceed, it means to go forth so maybe that's the answer
Fluctuate
The root word 'rrhagia' means 'burst forth, pour.'
forth leave
To and fro is another phrase that means back and forth. Back and forth can also refer to a quick dialogue between two people, and another word for that kind of back and forth is repartee.
Labor, exert.
The translation of the phrase 'passi paru' is They suffered to bring forth. In the word-by-word translation, the verb 'passi' means '[they] suffered'. The ablative supine 'paru' means '[I] bring forth'.
interesting fact: the two words Education and Ejaculation, are both defined: To bring forth.