mistletoe
noun [ U ] uk/ˈmɪs.əl.təʊ/ us/ˈmɪs.əl.toʊ/
美洲寄生子属植物;槲寄生枝条（常用作圣诞装饰物，按西方习俗，可以与站在枝条下面的人接吻）
an evergreen plant (= one that never loses its leaves) that grows on trees, with small, white fruits and pale yellow flowers. Mistletoe is often used as a Christmas decoration, and it is traditional to kiss someone under it.
They were kissing under the mistletoe at the office party. 办公室派对上，他们在檞寄生枝条下亲吻。