[沧海桑田 / 滄海桑田, cāng hǎi sāng tiánㄘㄤ ㄏㄞˇ ㄙㄤ ㄊㄧㄢˊ] lit. blue seas where once was mulberry fields (成语 saw); time brings great changes; life's vicissitudes#42797
[收之桑榆, shōu zhī sāng yúㄕㄡ ㄓ ㄙㄤ ㄩˊ] to lose at sunrise but gain at sunset (成语 saw); to compensate later for one's earlier loss; what you lose on the swings you gain on the roundabouts#94836