1. not a bed of roses=not all roses(玫瑰)

    If a situation is not all roses, there are unpleasant things to deal with as well as the pleasant ones.
    不尽如人意，并非尽善尽美
    e.g.
    Being in a relationship is not all roses, you know.
    你知道，谈恋爱并非总是柔情蜜意，也有不如意的事。

    1. be coming up roses(玫瑰)

    If something is coming up roses, it is happening successfully.
    进展顺利；蓬勃发展
    e.g.
    Everything’s coming up roses!
    一切进展顺利！

    1. gild the lily(百合)

    to improve or decorate something that is already perfect and therefore spoil it
    to cause something to be less good or beautiful than it already is by trying to improve it
    多此一举
    e.g.
    Some people add a little brandy to the recipe but I feel this is gilding the lily.
    有些人在食谱中加了一点白兰地，但我觉得这是多此一举。
    Should I add a scarf to this jacket or would it be gilding the lily?
    我应该在这件夹克上添加围巾或者会多此一举？

    1. shrinking violet

    a person who is very shy or modest and does not like to attract attention
    害羞腼腆的人
    e.g.
    She loves appearing on television and is no shrinking violet when it comes to expressing her views.
    她喜欢上电视，而且在表达观点时毫不羞怯。

    1. nip sth. in the bud(芽，花蕾)

    to stop something before it has an opportunity to become established
    把…消灭在萌芽状态，对…防患于未然
    e.g.
    Many serious illnesses can be nipped in the bud if they are detected early enough.
    如果及早确诊，许多恶疾可以治愈。
    It’s important to nip this kind of bullying in the bud.
    重要的是及早制止这种欺凌弱小的行为。

    1. be as fresh as a daisy(雏菊)

    to be full of energy and enthusiasm
    精神饱满
    e.g.
    After a good night’s sleep I’ll be as fresh as a daisy.
    好好睡上一宿觉后我就会精神焕发。

    1. hit the hay(草料)/sack

    to go to bed in order to sleep
    上床睡觉
    e.g.
    I have a busy day tomorrow, so I think I’ll hit the hay/sack.
    明天我会很忙，所以我看我该睡觉了。

    1. like watching grass(草) grow

    无聊的，无趣的
    e.g.
    Everyone loves that period drama, but, to me, it’s like watching grass grow.
    每个人都喜欢那部年代剧，但是，对我来说，它看着很无聊。
    Daytime TV is like watching grass grow, except not as colourful or useful.
    白天看电视很无聊，只是没有那么丰富多彩，也没有那么有用。