common laborer
伕 centers on a person who does manual work: a common laborer. The meaning is narrow and concrete, referring to an ordinary worker.
伕 combines 亻 (person) with 夫 (man, laborer), suggesting a person who works as a laborer. The exact historical development is uncertain, but the component relationship is straightforward.
A person 亻 beside a man 夫 who works with his hands: together they make a common laborer.
For フ, picture a laborer blowing out a breath of air after hard work: the sound 'foo' cues フ.