Brit., Informal an umbrella (sense )
Origin of brollyaltered from (um)brella
nounpl. brol·lies Chiefly British
Origin of brollyShortening and alteration of umbrella
- (UK, New Zealand, Australia, informal) Umbrella.
- It's going to rain today — you'd better take your brolly.
From umbrella, by contraction, + -y (diminutive).