slowed

"My friend told me there was something in the box, but I didn't know what it was yet. "

"The dog cautiously approached the sleeping cat. "

"The divers encountered a huge school of mackerel."

"The teacher explained the new math concept quickly. "

"A drought hinders the growth of plants."

"The traffic is slow during rush hour."

"The driver had to decelerate when he saw the red light. "

"The intricate making of the model airplane showcased the student's skill. "

"The school bus is a highway for getting students to school safely. "

"The pace slackened."

"to reduce weight, speed, heat, expenses, price, personnel etc."

"Testing for the new antidote is currently in progress."