All G&A a/c A/D a/r A/S a/s/l C/A See all meanings Idioms and phrases with a collision course idiom[ C/U ]   songs   plural A’s or As in Western tunes, the sixth Observe in the size (= number of notes) that begins around the note C, or even a set of notes determined by this ObserveWhen the ancient Greeks adopted the alphabet, that they had no u