有/没分寸

有/没分寸

Literally means:

have (no) Fen and Cun

Actually means:

haven't crossed (have crossed) the line; having (no) sense of propriety

分 and 寸 are both Chinese length unit.

This phrase figuratively means knowing how to talk or behave in proper way (not going beyond the acceptable limit).

分寸，长度单位。有/没分寸，比喻说话、做事不超过/超过适当的限度。