strike in

/S T R AY1 K IH0 N/
verb
  1. 1

    To enter suddenly or with force.

  2. 2

    To enter or add to a conversation; to say (something) by way of interruption or addition to a conversation.

  3. 3

    To take action; to become involved in a situation, so as to alter or prevent an action.

  4. 4

    To ally oneself (with someone), to take (someone's) side.

  5. 5

    To be or act in harmony (with something).

Source: https://en.wiktionary.org/wiki/strike%20in