沏 specifically means pouring hot water over loose leaves, different from 泡茶, which is broader 'to steep/soak tea.' 沏茶 emphasizes the moment of pouring; 泡茶 covers the whole process. Both are everyday verbs.
memory
沏 has 氵 (water) + 切 ('cut'). Think of water 'cutting' through tea leaves, exactly what happens when boiling water hits the leaves and releases the flavor.
