an obstruction that stands in the way (and must be removed or surmounted or circumvented)
something immaterial that stands in the way and must be circumvented or surmounted; "lack of imagination is an obstacle to one's advancement"; "the poverty of a district is an obstacle to good education"; "the filibuster was a major obstruction to the success of their plan"
a member of the British order of honor; ranks below a baron but above a knight; "since he was a baronet he had to be addressed as Sir Henry Jones, Bart."
impossible or difficult to perceive by the mind or senses; "an imperceptible drop in temperature"; "an imperceptible nod"; "color is unperceivable to the touch"
make known to the public information that was previously known only to a few people or that was meant to be kept a secret; "The auction house would not disclose the price at which the van Gogh had sold"; "The actress won't reveal how old she is"; "bring out the truth"; "he broke the news to her"; "unwrap the evidence in the murder case"
remove the outer cover or wrapping of; "Let's unwrap the gifts!"; "undo the parcel"
the act of dropping something; "they expected the drop would be successful"
a central depository where things can be left or picked up
a sudden sharp decrease in some quantity; "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"
a free and rapid descent by the force of gravity; "it was a miracle that he survived the drop from that height"
a predetermined hiding place for the deposit and distribution of illicit goods (such as drugs or stolen property)
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
a shape that is spherical and small; "he studied the shapes of low-viscosity drops"; "beads of sweat on his forehead"
give birth; used for animals; "The cow dropped her calf this morning"
stop pursuing or acting; "drop a lawsuit"; "knock it off!"
go down in value; "Stock prices dropped"
change from one level to another; "She dropped into army jargon"
utter casually; "drop a hint"
lose (a game); "The Giants dropped 11 of their first 13"
leave or unload, especially of passengers or cargo;
to fall vertically; "the bombs are dropping on enemy targets"
let fall to the ground; "Don't drop the dishes"
terminate an association with; "drop him from the Republican ticket"
the economic and political theories of Karl Marx and Friedrich Engels that hold that human actions and institutions are economically determined and that class struggle is needed to create historical change and that capitalism will ultimately be superseded by communism