Retardation; delay.

(music) A slowing down of the tempo; a ritardando.

(offensive, dated) A person with mental retardation.

(informal, offensive) A person or being who is extremely stupid or slow to learn.

(transitive) To keep delaying; to continue to hinder; to prevent from progressing.

(transitive) To put off; to postpone.

(transitive, obsolete) To be slow or dilatory to perform (something).

(intransitive) To decelerate; to slow down.

(intransitive, obsolete) To stay back.