(~s, collaborating, ~d)
1.
When one person or group ~s with another, they work together, especially on a book or on some research.
He ~d with his son Michael on the English translation of a text on food production...
The government is urging Japan’s firms to ~ with foreigners.
...a place where professionals and amateurs ~d in the making of music...
The two men met and agreed to ~.
V-RECIP: V with n on/in n/-ing, V with n, pl-n V on/in n/-ing, pl-n V
2.
If someone ~s with an enemy that is occupying their country during a war, they help them.
He was accused of having ~d with the secret police.
VERB: V with n, also V disapproval