兼课 jiānkè
[do some teaching in addition to one’s main occupation;hold two or more teaching jobs concurrently] 兼职教课
兼任本身职务以外的教书工作。
如:「他在校外还有兼课,算是大忙人。」
英语 to teach classes in addition to other duties, to hold several teaching jobs
【兼字的详细解释】:1.把两份并在一起;加倍:兼旬(二十天)。兼程。2.所具有的或所涉及的不只一方面:兼职。兼听则明,偏信则暗。