She does not understand our signal. ☊ 
Cô ấy không hiểu tín hiệu của chúng tôi. ☊ Abstract Objects 2 like: tín hiệu → →
Nur durch Zufall erkennt er eine Radarkontrolle rechtzeitig und kann abbremsen. ☊ Chỉ là sự ngẫu nhiên anh nhận được tín hiệu của máy định vị kịp thời và có thể phanh lại. ☊ (Lektion 67, Nr. 958) the busy signal ☊ busy ☊
radio signals/waves ☊ radio ☊
send sth to sb: A radio signal was sent to the spacecraft. ☊ send ☊
a danger/warning/distress, etc. signal ☊ signal ☊
At an agreed signal they left the room. ☊ signal ☊
The siren was a signal for everyone to leave the building. ☊ signal ☊
All I get is a busy signal when I dial his number (= his phone is being used). ☊ signal ☊
The rise in inflation is a clear signal that the government's policies are not working. ☊ signal ☊
Chest pains can be a warning signal of heart problems. ☊ signal ☊
Reducing prison sentences would send the wrong signals to criminals. ☊ signal ☊
traffic signals ☊ signal ☊
a stop signal ☊ signal ☊
Delays are occurring as a result of signal failure on the northbound line. ☊ signal ☊
TV signals ☊ signal ☊
a high-frequency signal ☊ signal ☊
a radar signal ☊ signal ☊
I couldn't get a signal on my cell phone. ☊ signal ☊
The satellite is used for transmitting signals around the world. ☊ signal ☊
Did you signal before you turned right? ☊ signal ☊
signal to/for sb to do sth: He signalled to us to join him. ☊ signal ☊
signal sb to do sth: She signalled him to follow. ☊ signal ☊
signal (that)...: She signalled (that) it was time to leave. ☊ signal ☊
signal which, what, etc...: You must signal which way you are going to turn. ☊ signal ☊
a weak light/signal/sound ☊ weak ☊