VICKI:Let's have a BBC Learning English party!

MATT:Yeah, why don't you come over and join in?

VICKI:Even if you can't come over here, you can still join in with our party!

MATT:Oooooh I like this song Vicki – come on – let's dance!

VICKI:This is a great song to dance to. And the lyrics even say 'get down' which means to dance.

MATT:Yeah it's quite informal and you hear it a lot in songs, especially in American English. Hey - look at Paul, he's really getting down.

Come over (to…): 短暫造訪,順便來訪,來
If you have nothing to do this evening, come over and have dinner with us.
如果你今天晚上沒事，到我們這里來吃晚飯吧。

Join in (with sb/sth): 參加,加入(活動)
she listens but she never joins in.
她只是聽,但從來不發表意見.