catflap.org Online Dictionary Query

  take part in the combat /tˈeɪk pˈɑːt ɪnðə kˈɒmbat/
  mitkämpfen [mil.]
   see: take part in sth., to (actively) participate in sth., join in sth., taking part, participating, joining, taken part, participated, joined, takes part, participates, joins, took part, participated, joined, join in the conversation, join in speaking sth., join in the game, let sb. join in with the cooking, Parents need to engage with sport and encourage their children to participate/join in.