1) Add through growth 2) Adhere or combine 3) Become attached 4) Blend 5) Build up 6) Build up gradually 7) Clump 8) Coalesce 9) Combine 10) Commingle 11) Conflate 12) Flux 13) Fuse 14) Grow 15) Grow by being added to 16) Grow together 17) Immix 18) Increase gradually 19) Meld 20) Merge 21) To add 22) To adhere 
• (v. i.) To grow together. • (v. i.) To adhere; to grow (to); to be added; -- with to. • (v. t.) To make adhere; to add. • (a.) Characterized by accretion; made up; as, accrete matter. • (a.) Grown together.
The addition of new recipients to a health plan; a Medicare term. 
Ac·crete' adjective 1. Characterized by accretion; made up; as, accrete matter. 2. (Botany) Grown together. Gray. Ac·crete' intransitive verb [ From Latin accretus , past participle of accrescere to increase.] 1. To grow together. 2. To adhere; to grow (to); to be added; -- with to . Ac·crete' transitive verb To make adhere; to add. Earle. 
To add terranes (small land masses or pieces of crust) to another, usually larger, land mass.
v. To add terranes (small land masses or pieces of crust) to another, usually larger, land mass.
v. To add terranes (small land masses or pieces of crust) to another, usually larger, land mass.
[v] - grow together (of plants and organs) 2. [v] - grow or become attached by accretion
verb grow together (of plants and organs); `After many years the rose bushes grew together`