contra-, contro-, counter, contre-

(Latin: against, opposed to, opposite, conflicting, different, clashing, unaccommodating)

countershaft
countersign
countersignature
countersink
counterslope
counterspy
counterstock
countervail (verb), countervails; countervailed; countervailing
To act against or to resist with equal force; to counterbalance a condition or situation: It seemed like the terrific thunderstorms in France tended to countervail, or offset, the family’s plans to go there on vacation.
To serve or supply as an equivalent, to compensate for.
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countervailing (adjective), more countervailing, most countervailing
Relating to having an equal but opposite effect: The politician has proposals with faults but he also has some countervailing advantages.
countervenom
Venom or poison used as an antidote to another poison.
counterweigh
counterweight (s) (noun), counterweights (pl)
A unit or system that provides a balance against something that is heavy or the relative lightness and heaviness that a system of units uses for expressing how much an object or quantity of matter weighs.
countrified
country
discounter (s) (noun), discounters (pl)
1. Someone who buys, sells, or lends money on financial instruments at a reduced price.
2. Anyone who discounts something as unimportant, irrelevant, or untrue.
3. A person who discounts something to lessen or to absorb its impact.