slow-up

He loved to go fast, and when Mr. Harry spoke to him to slow up again, he tossed his head with impatience.

Give her a speed of fifteen per second—she'll have to slow up to land, can't make it under forty-five minutes.

But this was a record trip, and it would be beneath her dignity to slow up for every petty rowboat that hailed her.

Now and then the carts and wagons in the street were slow in turning out, and O'Hara had to slow up.

As had happened on its second appearance, the thing began to slow up and its color gradually faded as it drew directly overhead.