slit

This term evokes a precise, linear separation of material, often implying a deliberate action or a specific design feature. It differs from a rip or a tear by suggesting a clean, straight edge rather than a jagged or accidental rupture. As a noun, it frequently describes functional openings in clothing or industrial materials. When used as a verb, it emphasizes the use of a sharp instrument to create a narrow gap, often for the purpose of opening an enclosure like an envelope or a packet.