a person who asks people to support a particular politician or party, either by going around an area or by phone Democratic/Republican canvassers 民主/共和党的画布画家
a person who tries to persuade people to buy something, use a service, etc., either by going around an area or by phone He works as a canvasser for a double glazing firm. 他曾在一家双层玻璃公司担任过推销员。