月賦
げっぷ · geppu · JLPT N1 · noun
installment
📅💴 月 = month, 賦 = pay out in portions: a small amount paid each month
Sounds like げっぷ (geppu), Japanese for belch. Both are small, regular releases, so the sound links easily to paying a little each month.
月 — pictograph of crescent moon
月 is a pictograph of a crescent moon, chosen over a full circle to distinguish it from 日 (sun). The inner strokes originally depicted the moon's shadow or markings. As a radical it often relates to the moon, time, or (via a lookalike form of 肉 'flesh') body parts.