TV series example of the word

The Big Bang Theory Season 5, Episode 4
But I couldn't get any other boys to join,

The Big Bang Theory Season 7, Episode 1
since Amy's out of town, would you like to join us?

The Big Bang Theory Season 4, Episode 9
I'm taking your gal out for dinner. You wanna join us?

Game of Thrones Season 3, Episode 1
why do you want to join us?

Game of Thrones Season 1, Episode 9
My mother wishes me to let Lord Eddard join the Night's Watch.