減らす
へらす · herasu · JLPT N3 · verb-godan
to decrease
📉 Sounds like hair-ah-sue: what age does to your hair, it diminishes
減 has the water radical 氵, as in a water level going down. 減らす (herasu) means you reduce something yourself. Its partner 減る (heru) means something decreases on its own. The -asu ending marks the version where you do the reducing.