Make weak walk along with weak

Example  

The bottom left black group is weak and too important to leave weak. Running out seems to make perfect sense.

Example  

A leaning technique to prevent the peep at a looks adequate but allows for a stronger white claim on the bottom area. The untrained eye has not noticed the weakness in White's bottom left group, which White will patch with if she does have the awareness.

Attack to defend  

Sweeping away White's eyespace like this, or ...

Example  

... like this, doesn't allow White to make a profitable attack. Both groups will now run into the centre (previous diagram - here Black has more of a base already).