to signal

• 招手示意，叫大伙儿进去

  wave one's hand to signal everybody to go in

• 互相以目光示意

  signal to one another with glances

• 我以目光示意，叫他不要再讲。

  I gave him a look to tell him to stop talking.

• 护士指了指门，示意他把门关上。

  The nurse pointed at the door, signalling for him to close it.