lit. to hone a bull's horn (成语 saw); fig. to waste time on an insoluble or insignificant problem; to bash one's head against a brick wall; a wild goose chase; a blind alley; to split hairs[cedict]
更
gēngㄍㄥ
gèngㄍㄥˋ
to change[cedict]
more; even more; further; still; still more[cedict]