[f. THIRD v. + -ING1.] (See quots.)
1670. Blount, Law Dict., Thirdings, the third part of the Corn or Grain growing on the Ground at the Tenants death, due to the Lord for a Heriot within a certain Mannor,… belonging to the Chappel of Turfat in Com. Heref. [So 1705 in Phillips; 1721 in Bailey; and in mod. dicts.]
1847–78. Halliwell, Thirding.… (2) A custom practised at the universities, where two thirds of the original price is allowed by the upholsterers to the students for household goods returned to them within the year.
