TgJ Mal2:14 :עַל דַיוי אַסהֵיד בֵינָך וֻבֵין אִיתַת יָנְקוּתָך‏ : because the Lord has testified between you and the wife of your youth
See the entire entry for shd vb. to testify

TgJ Mal2:14 :וְהִיא שוּתָפוּתָך וְאִיתַת קְיָמָך‏ : she being your wife and covenanted wife
See the entire entry for šaw/ūtāp̄ū, šaw/ūtāp̄ūṯā n.f. partnership