a portable shelter (usually of canvas stretched over supporting poles and fastened to the ground with ropes and pegs); "he pitched his tent near the creek"
intelligence activities concerned with identifying and counteracting the threat to security posed by hostile intelligence organizations or by individuals engaged in espionage or sabotage or subversion or terrorism
work together on a common enterprise of project; "The soprano and the pianist did not get together very well"; "We joined forces with another research group"
cooperate as a traitor; "he collaborated with the Nazis when they occupied Paris"
showing extreme cupidity; painfully desirous of another's advantages; "he was never covetous before he met her"; "jealous of his success and covetous of his possessions"; "envious of their art collection"