The bronze script of character Estimate is
The left is Water-Radical, the right is a bamboo measuring cylinder just like the following
The bottom is the cylinder, the vertical line is the handle, the dot in the middle of the handle is the hand holding the handle.
Each cylinder has a certain capacity, estimate not accurate. The seller inserts a cylinder into the Jar, submerged the cylinder into liquor, pulls it up, and pours the liquor into buyer's container. The original meaning of the character is Buy or Sell liquor.
The big seal script of the character is