瓜代

瓜代	guā dài	a changeover of personnel / a new shift / (lit.) replacement for soldier on leave for the melon-picking season
瓜	guā	melon; gourd; squash / (slang) a piece of gossip
代	dài	to be a substitute for; to act on behalf of; to replace; to substitute / generation; dynasty; age; period; (historical) era; (geological) eon