増える
ふえる · fueru · JLPT N4 · verb-ichidan
to increase
📈 fueru sounds like fuel: add fuel and the amount increases
The kanji 増 = earth 土 + 曽 (layered, piled up): earth heaped layer on layer, so the amount grows. 増える is intransitive (something increases by itself); its partner 増やす means to increase something.