半路上杀出个程咬金bàn lù shàng shā chū ge chéng yǎo jīnan unexpected obtruder bouncing in half way;pop in (/make one’s appearance unexpectedly) and try to poke one’s nose into the matter
❍ 我们正谈话的时候，他插嘴了，真是～。During our talk he popped in and tried to poke his nose into the matter. |