They like to horse around when the work is slow.

工作进展缓慢时他们喜欢闲逛。

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LL: Yes, in "horse around", "horse" is used as a verb, "to horse around" means "to play or joke with someone".

噢，horse在这里是用作动词，to horse around意思是“和别人开玩笑、闹着玩儿”。

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Around 1910 motorized carriages were beginning to replace horse-drawn cabs.

大约一九一零年，装有发动机的四轮车开始取代马车。

《柯林斯英汉双解大词典》

But Mr Bozic says both numbers and breeding quality have since improved, although not enough for him to contemplate selling a horse to eager Germans and Americans hanging around his door, or sending a team to the Olympics.

ECONOMIST: Horses with wings

To fit it to a horse you warm it up to soften it, and mould it around the animal's hoof.

ECONOMIST: Veterinary technology

The island is a national historic site and has prohibited the use of cars for more than a century--the best way to get around is by bicycle or horse-drawn carriage.

FORBES: Travel