watertight

While last Saturday's 2-2 draw may have put a small dent in Arsenal's Premier League title charge, their four-point lead at the top of the table has undoubtedly been built on a watertight defence.

The comforting, murmuring sound was like the lap of waves against the hull of a watertight ship, and she slept as well as she ever had in her life.

In the late 1860s, it got a huge boost with the introduction of a diving helmet fitted to a watertight suit.

All of this will need to be watertight to prevent a clash with the European Court of Human Rights in Strasbourg where complaints might be lodged that the UK has gone too far.

"But would I say the process is watertight? Absolutely not."