预告
yù gào · HSK 7
advance notice
📢 预 (beforehand/pre-) + 告 (tell, announce) = a pre-announcement, telling you ahead of time
预 carries the pre- sense (also in 预报 forecast, 预测 predict); 告 means to tell or announce (as in 告诉). Together: an advance notice, like a movie trailer that tells you what is coming.
告 — ox 牛 (top) + mouth 口
Originally a pictograph showing an ox with something on its head, possibly a yoke or sacrificial marker, combined with 口 (mouth) to suggest announcing or reporting. The character came to mean 'to tell' or 'to announce,' as in making a formal declaration. Today it commonly appears in words like 告诉 (to tell) and 报告 (report).