Problem and Reverse

problem

A state of difficulty that needs to be resolved.
- usage: "she and her husband are having problems"; "it is always a job to contact him"; "urban problems such as traffic congestion and smog"
- synonyms: job
A question raised for consideration or solution.
- usage: "our homework consisted of ten problems to solve"
A source of difficulty.
- usage: "one trouble after another delayed the job"; "what's the problem"
- synonyms: trouble

(n.) A question proposed for solution; a matter stated for examination or proof; hence, a matter difficult of solution or settlement; a doubtful case; a question involving doubt.
(n.) Anything which is required to be done; as, in geometry, to bisect a line, to draw a perpendicular; or, in algebra, to find an unknown quantity.

Webster's Revised Unabridged Dictionary

reverse

A relation of direct opposition.
- usage: "we thought Sue was older than Bill but just the reverse was true"
- synonyms: contrary, opposite
The gears by which the motion of a machine can be reversed.
- synonyms: reverse gear
An unfortunate happening that hinders or impedes; something that is thwarting or frustrating.
- synonyms: reversal, setback, blow, black eye
The side of a coin or medal that does not bear the principal design.
- synonyms: verso
American football. ( a running play in which a back running in one direction hands the ball to a back running in the opposite direction)
Turning in the opposite direction.
- synonyms: reversion, reversal, turnabout, turnaround

Change to the contrary.
- usage: "The trend was reversed"; "the tides turned against him"; "public opinion turned when it was revealed that the president had an affair with a White House intern"
- synonyms: change by reversal, turn
Turn inside out or upside down.
- synonyms: turn back, invert
Rule against.
- usage: "The Republicans were overruled when the House voted on the bill"
- synonyms: overrule, overturn, override, overthrow
Cancel officially.
- usage: "He revoked the ban on smoking"; "lift an embargo"; "vacate a death sentence"
- synonyms: revoke, annul, lift, countermand, repeal, overturn, rescind, vacate
Reverse the position, order, relation, or condition of.
- usage: "when forming a question, invert the subject and the verb"
- synonyms: invert

Directed or moving toward the rear.
- usage: "a rearward glance"; "a rearward movement"
- synonyms: rearward
Of the transmission gear causing backward movement in a motor vehicle.
- usage: "in reverse gear"
Reversed (turned backward) in order or nature or effect.
- synonyms: inverse

(a.) Hence, to overthrow; to subvert.
(a.) That which appears or is presented when anything, as a lance, a line, a course of conduct, etc., is reverted or turned contrary to its natural direction.
(a.) To turn back; to cause to face in a contrary direction; to cause to depart.
(a.) The act of reversing; complete change; reversal; hence, total change in circumstances or character; especially, a change from better to worse; misfortune; a check or defeat; as, the enemy met with a reverse.
(a.) That which is directly opposite or contrary to something else; a contrary; an opposite.
(a.) The back side; as, the reverse of a drum or trench; the reverse of a medal or coin, that is, the side opposite to the obverse. See Obverse.
(a.) To overthrow by a contrary decision; to make void; to under or annual for error; as, to reverse a judgment, sentence or decree.
(a.) To change totally; to alter to the opposite.
(a.) Reversed; as, a reverse shell.
(v.i.) To return; to revert.
(a.) To turn upside down; to invert.
(a.) To cause to return; to recall.
(v.i.) To become or be reversed.
(a.) A thrust in fencing made with a backward turn of the hand; a backhanded stroke.
(a.) Turned upside down; greatly disturbed.
(a.) A turn or fold made in bandaging, by which the direction of the bandage is changed.
(a.) Turned backward; having a contrary or opposite direction; hence; opposite or contrary in kind; as, the reverse order or method.

Webster's Revised Unabridged Dictionary

reverse is an informal name for a reverse repurchase agreement.