'hit the core' is a correct and usable phrase in written English.
You can use it to express that someone has succeeded in addressing the primary or essential part of something. For example, "He hit the core of the problem with his speech, and the audience instantly understood."
But none of those problems hit the core of Facebook's business — digital advertising — the way the discrepancy over measurement of video viewership does.
For a successful invasion of Iraq, two operational options are basically valid: a surgical operation to hit the core of the regime, and a full-scale operation to include major airborne and ground forces, perhaps 300,000 soldiers.
The combination of the one-child policy and rising rates of college education is only starting to hit the core of China's factory work force: 18- to 21-year-olds not in college.
While their messages differ politically, the speeches of both two-term presidents seem to hit the core of what voters were looking for during their respective eras.
When we raise our voices loudly and fully enough, we can hit the core sensitivity of politicians: the desire for votes.
To defeat ISIS, the world needs to hit the core of the group, and this means untying the shroud of knots surrounding it and cutting blood off from ISIS' heart.
8. newtonica by Field System ($4.999) Strange, but beautifully designed action game in which you rotate a sphere so that incoming meteors hit the cores with the matching colors.
"This crisis is hitting the core of the euro zone," Olli Rehn, the European commissioner for economic and monetary affairs, said Monday.
Producing a useful flake requires hitting the core at just the right place and angle.
The humble squat might just be the most effective exercise you can do: It engages the entire lower half of the body, including the hips, glutes, quads, hamstrings and calves, while also hitting the core, shoulders and back.
