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3.
Forget somthing or leave it alone
Chav 1, Yo blad, lets go to the shops man

Chav 2, Nah man allow it blad
by BarringtonBH January 17, 2012
 
1.
"allow it" means to just leave something alone, or don't worry about it. People in West London say this quite often.
Ahmed: Wanna walk to the station?
Joseph: Nah, allow it blud, can't be arsed, I'mma get the bus.
by ak47 February 27, 2004
 
2.
It basically means lyk to leave summink coz it's out of order or it's a long ting.
Jon.K:Come we go shop Tracy!
Tracy: Allow it man dats a trek lyk.
by Tracy August 17, 2004
 
4.
something whiny school kids say when they want something they're not going to ever get
Student: miss, can we do an experiment where we get drunk and stuff

Sensible Teacher: no

Student: Oh miss, allow it!
by MissTerry September 17, 2009