咬住 (yǎo zhù) literally means 'to bite and hold' — combining 咬 (yǎo), 'to bite', with 住 (zhù), a resultative complement meaning 'to hold in place' or 'to secure'. Together, they express the action of gripping something tightly with the teeth, preventing it from moving or escaping. This phrase is commonly used for animals (e.g., dogs biting a toy or intruder) but extends figuratively to describe determined, tenacious action — such as holding onto an idea, maintaining focus, or persisting in effort.

In everyday speech, 咬住 often appears in dynamic contexts involving physical control or mental perseverance. It implies active, sustained pressure rather than a momentary bite. While the image is vividly physical, native speakers frequently use it metaphorically: a student might 咬住目标 (yǎo zhù mùbiāo) — 'grip their goal' — meaning they stay focused and refuse to let go of their aim. The phrase carries a positive connotation of resolve and determination when used figuratively.