尺寸 (chǐ cùn) refers to the exact measurements or dimensions of an object, especially for clothing or tailoring. For general size (big/small), use 大小 (dà xiǎo); for numbered clothing/shoe sizes, use 号 (hào). Figuratively, 尺寸 means propriety or knowing one's limits in speech/behavior, similar to 分寸 (fēn cun) which focuses on tact and proportion.