増減
ぞうげん · zougen · JLPT N2 · noun
decrease
⚖️ 増 zō = increase + 減 gen = decrease, so 増減 = the up-and-down swing of a value
Each kanji names one direction: 増 (zō) means rising and 減 (gen) means falling. Put together, 増減 covers movement in both directions, which is why it means fluctuation.