main line

Nicknames are a tell for Trump — a brand for his main line of attack.

The depletion of mangrove forests along the shoreline - the coast’s main line of defence against erosion - is to blame.

A message The Associated Press left on the city’s Law Department main line seeking comment Monday wasn’t immediately returned.

The extensive corroborating evidence is just one way the prosecution is cutting off the defense’s main line of attack.

But it has infused the technology into its main lines of business, such as cloud computing contracts and subscriptions for its email and other online services.