sub-dŏcĕo, ēre, v. a. and n.,
to teach as an assistant , to act as an assistant-teacher for a person (very rare): aliquem, Cic. Att. 8, 4, 1: subdocere grammatico, Aug. Conf. 8, 6.
sub-doceō —, —, ēre, to teach as a deputy school-master: meo labore subdoceri. ...
An Elementary Latin Dictionary