TAD B3.1 R.4 :יהבת לי זפת כסף שקלן הו ארבעה באבני מלכא במרביתה ירבה עלי‏ : you have lent me a loan of four shekels by the royal weight; it will accrue interest against me by its normal interest rate
See the entire entry for marbī, marbīṯā n.f. growth

TAD B3.1 R.4 :יהבת לי זפת כסף שקלן הו ארבעה באבני מלכא במרביתה ירבה עלי‏ : you have lent me a loan of four shekels by the royal weight; it will accrue interest against me by its normal interest rate
See the entire entry for rby vb. to increase