To delay the progress of, especially in school.
To act with reserve; to contain one's full measure or power.
To contain; stop.
To keep delaying; to continue to hinder; to prevent from progressing.
To put off; to postpone.
To decelerate; to slow down.
Retardation; delay.
A slowing down of the tempo; a ritardando.
A person or being who is extremely stupid or slow to learn.