WordNet sense 1 (stop associating with):

drop, send packing, send away

WordNet sense 2 (terminate the employment of):

can, fire, sack, terminate, force out, give the axe, give the sack, give notice

WordNet sense 3 (end one's encounter with somebody by causing or permitting the person to leave):

usher out

WordNet sense 4 (cease to consider; put out of judicial consideration):

throw out

WordNet sense 5 (bar from attention or consideration):

discount, disregard, ignore, discount, push aside, brush aside

WordNet sense 6 (declare void):

dissolve