加快 means 'to speed up' or 'to accelerate' — it’s a transitive verb that indicates making a process, action, or movement happen more quickly. The character 加 (jiā) means 'to add' or 'to increase', and 快 (kuài) means 'fast' or 'quick'. Together, they literally convey 'adding speed', which aligns perfectly with the English meaning. It’s commonly used in formal and semi-formal contexts — such as news reports, workplace communication, policy documents, and everyday suggestions about efficiency.

This verb typically follows a subject and precedes a noun (often an abstract process like 'development', 'construction', or 'recovery') or a verb phrase introduced by 的 (e.g., 加快学习进度). It rarely stands alone without an object or complement, and it’s almost never used to describe physical motion of people or animals directly — for that, 快走 or 跑快点 are more natural. It conveys intentionality and purpose: someone is deliberately acting to increase pace.