no obj.
1- play music or otherwise perform for voluntary donations in the street or in a subway街头（或地铁）卖艺：
the group began by busking on Philadelphia sidewalks
这一群人是从在费城街上卖艺起步的
as noun busking busking was a real means of living.卖艺是实在的谋生手段。
1.1
busk it
informal improvise〈非正式〉临时应付, 即兴创作。
派生词
busker
noun词源
mid 17th cent.: from obsolete French busquer 'seek'， from Italian buscare or Spanish buscar, of Germanic origin. Originally in nautical use in the sense 'cruise about， tack'， the term later meant 'go about selling things'， hence 'go about performing' （mid 19th cent.）.