What is "to water stock"

Water \Wa"ter\, v. t. [imp. & p. p. Watered; p. pr. & vb. n. Watering.] [AS. w[ae]terian, gew[ae]terian.]

1. To wet or supply with water; to moisten; to overflow with water; to irrigate; as, to water land; to water flowers.

   With tears watering the ground.
   --Milton.

   Men whose lives gilded on like rivers that water the woodlands.
   --Longfellow.

2. To supply with water for drink; to cause or allow to drink; as, to water cattle and horses.

3. To wet and calender, as cloth, so as to impart to it a lustrous appearance in wavy lines; to diversify with wavelike lines; as, to water silk. Cf. Water, n., 6.

4. To add water to (anything), thereby extending the quantity or bulk while reducing the strength or quality; to extend; to dilute; to weaken.

   To water stock, to increase the capital stock of a company by issuing new stock, thus diminishing the value of the individual shares. Cf. Water, n., 7. [Brokers' Cant]