What does "shower" mean?

Additional senses

1. 2.A fall or rain or hail of short duration; sometimes, but rarely, a like fall of snow. In drought or else showers. Chaucer. Or wet the thirsty earth with falling showers. Milton.
2. 3.That which resembles a shower in falling or passing through the air copiously and rapidly. With showers of stones he drives them far away. Pope.
3. 4.A copious supply bestowed. [R.] He and myself Have travail'd in the great shower of your gifts. Shak. Shower bath, a bath in which water is showered from above, and sometimes from the sides also.
4. 5.To water with a shower; to Lest it again dissolve and shower the earth. Milton.
5. 6.To bestow liberally; to destribute or scatter in Shak. Cshowers down greatness on his friends. Addison.
6. 7.To rain in showers; to fall, as in a hower or showers. Shak.