催促
さいそく · saisoku · JLPT N2 · noun
urge
⏰ 催 (urge) + 促 (press) = two urging characters stacked: pressing someone to act now
催 means to hurry or urge, and 促 means to prompt or press, so the pair doubles the idea of urging. Use it when you press someone to take action or demand a reply.
催 — person 亻 + 崔 (cuī, phonetic)
催 is a semantic-phonetic compound. The person radical 亻 gives the meaning, since urging or hurrying is something one person does to another, while 崔 supplies the sound 'cui'. The original sense was to press or push someone to act, which broadened to today's meaning of urging, hastening, or prompting.