Never swim alone, and keep a constant watch on weak swimmers.

So keep constant watch for warning signs like slipping payments, roundnumber or unsigned cheques.

Only constant watch and an adversarial, not a cosy, relationship with our politicians will really push through these changes.

The doctors and nurses keep constant watch over them until they become strong enough to be transferred to a less intensive state of care.

But whatever; on a motorway you have to keep a constant watch on the speedo.