Wiktionary
vb. (context idiomatic informal English) To be friendly toward (''with'') someone, especially in an ingratiating way.
WordNet
Usage examples of "chum up".
I looked around in 'C' Hall for someone else to chum up with, someone who was a likely prospect for contacting an escape organization -- if the damned thing existed.
And you now, which would you rather do: be in with a lot of greasy mechanics and laboring-men, or chum up to a real fellow like Lord Wycombe, and get invited to his house for parties?
There was one woman who had been very keen to look after me, and chum up with me generally--a Mrs.
The crew, most of them trying to struggle as they saw what was going to happen, were shot, one by one, and tossed over to chum up the sharks.
Patches of ugly reddish sand continued to chum up around the Great North Bay and at a point in Sligo that bordered Freetown.
On the less-traveled and unpaved section of the south road beyond the city, a company of lancers would chum up the road enough to stop any wagon, and after the first two or three companies traveled it, the later riders would have great difficulty traveling with any speed, and the lower-lying sections would become, if not impassable, places where men and mounts bunched into groups making their way through slowly.
He has to boost himself back up, and the easiest way to do that is to chum up to Gar.
There was one woman who had been very keen to look after me, and chum up with me generally-a Mrs.
Cast a light in the darkness, dont just chum up the same old sediment at the bottom of the river.