"signals from the boat suddenly stopped"
"he awaited the signal to start" "the victory was a signal for wild celebration"
"the year saw one signal triumph for the Labour party"
"He signed his disapproval with a dismissive hand gesture" "The diner signaled the waiters to bring the menu"
"These symptoms indicate a serious illness" "Her behavior points to a severe neurosis" "The economic indicators signal that the euro is undervalued"