affiancing
Webster's Dictionary (GCIDE)
affiance \af*fi"ance\, v. t. [imp. & p. p. affianced ([a^]f*f[imac]"anst); p. pr. & vb. n. affiancing ([a^]f*f[imac]"an*s[i^]ng).] [Cf. OF. afiancier, fr. afiance.]
1.To betroth; to pledge one's faith to for marriage, or solemnly promise (one's self or another) in marriage. [1913 Webster]
To me, sad maid, he was affianced.— Spenser.[1913 Webster]
2.To assure by promise. [Obs.] --Pope. [1913 Webster]