解锁 literally means 'to untie a lock' — combining 解 (jiě, 'to untie, loosen, or solve') and 锁 (suǒ, 'lock'). As a verb, it most commonly refers to the digital action of unlocking a device — such as a smartphone, tablet, or computer — typically by entering a password, using a fingerprint, or facial recognition. It can also describe unlocking physical objects like doors or gates, though this usage is less frequent in modern spoken Chinese.

The term is widely used in everyday tech-related contexts and appears frequently in instructions, app interfaces, and casual conversation. It’s often part of compound verbs like 解锁屏幕 (jiě suǒ píng mù, 'unlock the screen') or 解锁功能 (jiě suǒ gōng néng, 'unlock a feature'). Unlike the noun form 锁 (suǒ, 'lock'), 解锁 is almost always verbal and rarely used as a noun without modification (e.g., 解锁步骤, 'unlocking steps').