The central bank issues bills to mop up the liquidity created from buying reserves, which obliging banks hold at low rates.

ECONOMIST: Currencies

If the Fed truly wants to tighten, there's an easy, time-tested way to do it: sell bonds from its portfolio to mop up the excess money it's mistakenly spilled onto the financial markets for the past 18 months.

FORBES: Fact and Comment

Two minutes later Everton were ahead when Baines picked out the distinctive mop-haired figure of Fellaini with a low ball from the left leaving the Belgian with a tap-in at the far post.

BBC: Aston Villa 3-3 Everton

Ruminah, from East Java, said she was let out for only one hour a day to mop the floor.

CNN: Malaysia's Secret Vice