(TTS發音) 1. offer oneself as a recruit；join the army 參軍；入伍
He joined up at the age of twenty. 他20歲參了軍。
On leaving collage，my brother joined up. 我的兄弟大學畢業後參軍了。
2. connect；link together 連接
The electrician joined the wires up. 電工把電線接好了。
3. form or enter into an alliance or league；link up 組成或參加聯盟；會合
The two companies were ordered to join up with each other at Bridge No. 3 before dawn. 那兩個連奉命于黎明前在3號橋會師。
