pencil something in

fill in an area or shape with pencil strokes

用铅笔填入

a lot of the outlines had been pencilled in.

很多草图已经用铅笔填好了。

arrange, forecast, or note down something provisionally or tentatively

（暂时或姑且）安排，预测；记下

May 15 was pencilled in as the date for the meeting.

暂定5月15日作开会的日期。