To interrupt or impede.
To throw into confusion or disorder.
To improve a product or service in ways that displace an established one and surprise the market.
To put off; to postpone.
To decelerate; to slow down.
To keep delaying; to continue to hinder; to prevent from progressing.
Retardation; delay.
A slowing down of the tempo; a ritardando.
A person or being who is extremely stupid or slow to learn.