tack,vb.1.

To add (one’s own period of land possession) to a prior possessor’s period to
establish continuous adverse possession for the statutory period. [Cases: Adverse Possession 43.
C.J.S. Adverse Possession § 154.] 2. To annex (a junior lien) to a first lien to acquire priority over
an intermediate lien.
[Blacks Law 8th]