屏蔽 (píngbì) is a verb meaning 'to shield' or 'to block' — literally 'to screen and conceal'. The first character 屏 (píng) means 'screen' or 'barrier', often implying physical or visual obstruction, while 蔽 (bì) means 'to cover', 'to hide', or 'to obscure'. Together, they convey the idea of actively preventing access, visibility, or transmission. Though it appears in literary contexts (e.g., shielding from harm), it’s most common today in technology: blocking websites, filtering messages, muting notifications, or disabling signals.

The word carries a neutral-to-formal register and is rarely used for physical shielding in everyday speech (e.g., you wouldn’t say 屏蔽 the sun — use 遮挡 instead). It implies intentionality and technical or systemic intervention, not passive coverage. In cybersecurity, social media, and network settings, 屏蔽 is standard terminology for user-initiated blocking actions — such as hiding posts from certain accounts or restricting content distribution.