Expressions (phrases, clauses, etc.), Ichidan verb
to greet; to call out (to); to start talking (to)
彼女は通り過ぎるときに必ず声をかけた。She didn't pass me without speaking to me. to invite; to get in touch (with); to give a shout (to); to let (someone) know (one is in the area or has time to meet, etc.)
to cheer (on); to give vocal support (to)
Also written 声を掛ける【こえをかける】