We are under heavy strain due to our userbase's normal activities.

A boom in travel has put a heavy strain on the nation's airports and the critical air traffic control system.

As the iPhone gets more features, it puts a heavier strain on the network.

The delay also put a heavy strain on discipline.

He would either make a mess going through, or break the truck from heavy strain during most events.

McFarlane could feel a heavy strain shuddering through the ship.

In particular, it has put a heavy strain on state and local governments.

He presented all the aspect of a man under a heavy strain.

What with one thing and another the life put too heavy a strain upon Nigel.

A sudden heavy strain or increased pressure to the lower back.