Doppler shift 
noun Physics
A change in frequency due to the Doppler effect.This is simply the relativistic Doppler shift for light....
- This causes a periodic Doppler shift of the spectrum of one or both members of the pair.
- The Doppler shift happens with light as well as with sound.
- —— and counting
- —— a pop
- —— as we know it
- —— a treat
- —— be damned
- —— from hell
- —— is one thing, —— is another
- —— of the year
- —— oneself sick
- —— one's guts out
- —— one's head off
- —— one's last
- —— one's socks off
- —— or bust
- —— rides again
- ——'s finest
- —— speaking
- —— that was
- —— the hell out of
- —— the living daylights out of
- —— to a fault
- —— to speak of
- —— up a storm
- ’cause
- ’nuff