Definition
速 is a bound form (b.f.) that must attach to another character to form a word. Its most common meaning is 'fast, rapid' or 'speed', appearing in compounds like 速度 (speed), 快速 (fast), and 迅速 (rapid). It also has a classical, literary sense of 'to invite', which survives almost exclusively in the fixed expression 不速之客 (an uninvited guest). As a bound form, you cannot use it alone as a standalone word.
b.f.
(bound form) fastrapidspeed(bound form, literary) to invite (only in fixed expressions such as 不速之客)
Examples
- 。Zhè liàng chē de sù dù hěn kuài.This car's speed is very fast.
- 。Jiùyuán xíngdòng fēicháng xùn sù.The rescue operation was very rapid.
- 。Tāmen jiā lái le yí wèi bú sù zhī kè.An uninvited guest came to their home.
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