give an untimely help ; come and offer to help when the work's all done ; give sb. an umbrella after the rain is over
雨后送伞，汉语成语，拼音是yǔ hòu sòng sǎn，意思是比喻事后献殷勤，也比喻帮助不及时。出自《康熙大帝》。
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