{i} (Slang) person with mental retardation (derogatory); (Slang) stupid person, person who behaves foolishly (derogatory); delay, retardation, deceleration
cause to move more slowly or operate at a slower rate; "This drug will retard your heart rate" be delayed
To keep delaying; to continue to hinder; to prevent from progress; to render more slow in progress; to impede; to hinder; as, to retard the march of an army; to retard the motion of a ship; opposed to accelerate
slow the growth or development of; "The brain damage will retard the child's language development"
To put off; to postpone; as, to retard the attacks of old age; to retard a rupture between nations
If something retards a process, or the development of something, it makes it happen more slowly. Continuing violence will retard negotiations over the country's future. = slow down