n.

1. a small indefinite quantity (especially of a liquid); "he had a drop too much to drink"; "a drop of each sample was analyzed"; "there is not a drop of pity in that man"; "years afterward, they would pay the blood-money, driblet by driblet"--Kipling;
   drib, driblet
2. a shape that is spherical and small;
   bead, pearl
   
   • he studied the shapes of low-viscosity drops
   • beads of sweat on his forehead
3. a sudden sharp decrease in some quantity;
   dip, fall, free fall
   
   • a drop of 57 points on the Dow Jones index
   • there was a drop in pressure in the pulmonary artery
   • a dip in prices
   • when that became known the price of their stock went into free fall
4. a steep high face of rock;
   cliff, drop-off
   
   • he stood on a high cliff overlooking the town
   • a steep drop
5. a predetermined hiding place for the deposit and distribution of illicit goods (such as drugs or stolen property)
6. a free and rapid descent by the force of gravity;
   fall
   
   • it was a miracle that he survived the drop from that height
7. a curtain that can be lowered and raised onto a stage from the flies; often used as background scenery;
   drop curtain, drop cloth
8. a central depository where things can be left or picked up
9. the act of dropping something
   
   • they expected the drop would be successful

v.

1. let fall to the ground
   
   • Don't drop the dishes
2. to fall vertically
   
   • the bombs are dropping on enemy targets
3. go down in value
   
   • Stock prices dropped
4. fall or drop to a lower place or level;
   sink, drop down
   
   • He sank to his knees
5. terminate an association with
   
   • drop him from the Republican ticket
6. utter casually
   
   • drop a hint
7. stop pursuing or acting;
   knock off
   
   • drop a lawsuit
   • knock it off!
8. leave or unload, especially of passengers or cargo;;
   drop off, set down, put down, unload, discharge
9. cause to fall by or as if by delivering a blow;
   fell, strike down, cut down
   
   • strike down a tree
   • Lightning struck down the hikers
10. lose (a game)
    
    • The Giants dropped 11 of their first 13
11. pay out;
    spend, expend
    
    • spend money
12. lower the pitch of (musical notes);
    flatten
13. hang freely;
    dangle, swing
    
    • the ornaments dangled from the tree
    • The light dropped from the ceiling
14. stop associating with;
    dismiss, send packing, send away
    
    • They dropped her after she had a child out of wedlock
15. let or cause to fall in drops;
    dribble, drip
    
    • dribble oil into the mixture
16. get rid of;
    shed, cast, cast off, shake off, throw, throw off, throw away
    
    • he shed his image as a pushy boss
    • shed your clothes
17. leave undone or leave out;
    neglect, pretermit, omit, miss, leave out, overlook, overleap
    
    • How could I miss that typo?
    • The workers on the conveyor belt miss one out of ten
18. change from one level to another
    
    • She dropped into army jargon
19. grow worse;
    devolve, deteriorate, degenerate
    
    • Her condition deteriorated
    • Conditions in the slums degenerated
    • The discussion devolved into a shouting match
20. give birth; used for animals
    
    • The cow dropped her calf this morning