chain (something) down

chain (something) down

To fasten or anchor something in place with chains. Chain your bike down so that no one steals it while you're shopping.
See also: chain, down

chain someone or something down

to fasten someone or something down with chains. They chained down the the bicycle rack so no one could steal it. We chained the tool-shed down so a strong wind would not blow it over.
See also: chain, down