Be part of.

synoniem: attach to.

Roget 56: enter into, enter into the composition of; be a component etc. n. be part of, form part of etc. 51; merge in, be merged in; be implicated in; share in etc. (participate) 778; belong to, appertain to; combine, inhere in, unite.    form, make, constitute, compose.    ... meer laten zien