a children's bicycle designed to attach to the back of an adult's bicycle

I bike the kids to school. My son sits in the trailer and my daughter goes on the tagalong. 我骑自行车送孩子上学。儿子坐在拖车里，女儿骑在后挂式儿童自行车上。

Careless drivers doing 60mph veered too close to my children's tagalong. 粗心的司机以60英里的时速行驶，离我孩子们的后挂式自行车太近了。

someone who goes somewhere or does something with another person or other people, especially when they has not been invited

I was only meant to be a tagalong when my wife and her friends went skiing. 当我妻子和她朋友们去滑雪的时候，我不过是个跟班而已。

He would portray the teen as a tagalong, talked into the burglary with no idea someone would be hurt. 他会说这个少年不过是一个跟屁虫，在不知道有人会受伤的情况下，受人教唆参与了入室盗窃。