congermanesco
From LSJ
con-germānesco: ĕre,
I v. inch. n. germanus, to grow together with one, grow up with: coalescere, conjungi vel consociari, Non. p. 90, 16 sq. (ante- and post-class., and very rare): cum illis, Quadrig. ap. Non. l. l.; so, mecum, App. M. 2, p. 119, 14.