宣布 + 订婚
订婚 (dìnghūn) means "to get engaged" or "engagement." It combines 订 (to settle/arrange) with 婚 (marriage), referring to the formal agreement to marry. It can be used as both a verb (他们订婚了) and a noun (宣布订婚). The related term 婚礼 refers to the wedding ceremony itself.
他们相恋三年后终于订婚了。
tāmen xiāngliàn sān nián hòu zhōngyú dìnghūn le.
They finally got engaged after three years of dating.
听说小李上个月和女朋友订婚了,你知道吗?
tīngshuō xiǎo lǐ shàng gè yuè hé nǚpéngyǒu dìnghūn le, nǐ zhīdào ma?
I heard Xiao Li got engaged to his girlfriend last month — did you know?
她在朋友圈宣布订婚的消息,大家都纷纷祝福。
tā zài péngyǒuquān xuānbù dìnghūn de xiāoxi, dàjiā dōu fēnfēn zhùfú.
She announced her engagement on her social media, and everyone sent their congratulations.