I'm feeling a bit peckish; I think I'll grab a snack from the kitchen.
is used to describe a slight feeling of hunger or a desire to eat something small.
I owe him twenty quid for the tickets to the concert.
refer to one pound sterling, which is the currency of the United Kingdom.
I met a friendly bloke at the pub last night, and we had a great conversation.
which is used to refer to a man