奮筆疾書

to write at a tremendous speed

to exert oneself (bound form)

pen / pencil / writing brush / to write or compose / the strokes of Chinese characters / classifier for sums of money, deals / CL:支[zhi1],枝[zhi1]

(bound form) disease; ailment / (bound form) swift / (literary) to hate; to abhor

to scribble rapidly

abbr. for 書經|书经[Shu1 jing1]

book / letter / document / CL:本[ben3],冊|册[ce4],部[bu4] / to write