The core of something such as a problem or an issue is the part of it that has to be understood or accepted before the whole thing can be understood or dealt with. the ability to get straight to the core of a problem = heart
a bar of magnetic material (as soft iron) that passes through a coil and serves to increase the inductance of the coil
If someone is shaken to the core or shocked to the core, they are extremely shaken or shocked. Leonard was shaken to the core; he'd never seen or read anything like it. Congress of Racial Equality. In earth science, the part of the Earth that starts about 1,800 mi (2,900 km) beneath the surface and extends downward. It consists largely of an iron-rich metallic alloy and is thought to have a two-part structure: an outer fluid region and a solid, extremely dense inner region that measures only about 1,500 mi (2,400 km) across. The alloy composition is mainly iron with small amounts of nickel. This composition is deduced from the chemistry of iron meteorites that presumably came from the breakup of a planetary body that also had an iron core. See also crust; mantle
In solar astronomy, the innermost part of the Sun, where energy is generated by nuclear reactions more!
If you core a fruit, you remove its core. machines for peeling and coring apples
A deposit paid by the purchaser of a rebuilt part, to be refunded on return of a used, rebuildable part, or the returned rebuildable part itself. Said to be an acronym for Cash On REturn, but that may be a backronym
A core team or a core group is a group of people who do the main part of a job or piece of work. Other people may also help, but only for limited periods of time. We already have our core team in place A core of about six staff would continue with the project
especially, the central part of fruit, containing the kernels or seeds; as, the core of an apple or quince
You can use to the core to describe someone who is a very strong supporter of someone or something and will never change their views. For example, you can say that someone is Republican to the core. The villagers are royalist to the core. = through and through