signals

"Signals" is a versatile word with a few closely related but distinct meanings. It works as both a noun (things you see, hear, or detect) and a verb (the act of communicating something). Here are the most common and useful senses.

1nouna sign or gesture to communicate

A signal is something you do — a movement, a sound, or a light — to tell someone something without using words. Think of a referee blowing a whistle, or a driver using a turn indicator. That action is a signal.

everyday language · Modern, widely used

The coach gave the players a signal to stop the game.

The traffic light is a signal that tells drivers when to go or stop.

She raised her hand as a signal that she needed help.

2nouna transmitted electronic or radio wave

In technology, a signal is an invisible wave that carries information — like the Wi-Fi signal that connects your phone to the internet, or the radio signal that brings music to your car. You cannot see it, but devices can detect and use it.

technology / science · Modern, widely used

My phone has no signal in this area, so I cannot make a call.

The TV antenna picks up signals from broadcasting towers.

The satellite sends signals back to Earth every few seconds.

3nounfigurativean indication or hint of something

Sometimes a signal is not a physical thing — it is a clue or a sign that something is happening or about to happen. For example, if someone keeps checking their watch, that is a signal that they want to leave.

everyday language · Modern, widely used · figurative

Rising prices are a signal that the economy is changing.

His silence was a clear signal that he was unhappy.

The dark clouds were a signal that rain was coming.

4verbto make a gesture or sign to communicate

When you signal, you use a movement, a light, or a sound to tell someone something. For example, a driver signals before turning by switching on the indicator light.

everyday language · Modern, widely used

He signaled to the waiter that he wanted the bill.

The pilot signaled the ground crew before landing.

She signaled left before turning the corner.

5verbfigurativeto indicate or suggest something

You can also use 'signals' to mean that something points to or suggests a fact or a change — even without a deliberate action. For example, a company cutting jobs signals that it is in financial trouble.

business / everyday language · Modern, widely used · figurative

The new policy signals a big change in the government's approach.

His tone of voice signaled that he was not pleased.

Falling sales signal that the product is losing popularity.