tacking

noun

Loose temporary stitches in dressmaking etc.
The act of changing tack.
A union of securities given at different times, all of which must be redeemed before an intermediate purchaser can interpose a claim.
“The English doctrine of tacking was first solemnly established in Marsh v . Lee , under the assistance of Sir Matthew Hale , who compared the operation to a plank in shipwreck gained by the last mortgagee”
The joining together of consecutive periods of possession of property, especially between squatters in cases of adverse possession.