警備

けいび · keibi · JLPT N2 · noun

security

🛡️ 警備 = 警 alert + 備 prepare: a guard stays alert and ready, so it means defense and security

The 警 in 警備 also appears in 警察 (police), so both relate to watching for danger. 備 means prepare or equip, so policing means being alert and ready.