chop of tea at English => English (Websters 1913) Of Explained:
Chop \Chop\, n. [Chin. & Hind. ch[=a]p stamp, brand.]
1. Quality; brand; as, silk of the first chop.
2. A permit or clearance.
{Chop dollar}, a silver dollar stamped to attest its purity.
{chop of tea}, a number of boxes of the same make and quality
of leaf.
{Chowchow chop}. See under {Chowchow}.
{Grand chop}, a ship's port clearance. --S. W. Williams.