They moved with alert expectation, eyes and ears tuned to any hint of a threat.

You wouldn't, of course, but you keep your ears tuned anyway.

The man looked to neither right nor left, his eyes fixed ahead, ears tuned for the command to run.

Bolan carried on, his ears tuned to the movement of the man behind him.

He scanned the surrounding terrain, ears tuned to the slightest sound.

He stepped into the hallway on full alert, ears tuned but hearing nothing.

Not moving, he examined the scene before him, ears tuned for the slightest sound that might spell danger.

Jake's ears tuned to that comment like a hunting dog.

Over coffee we just sat around, keeping an ear tuned for movement.

All the while I kept my ears tuned for any sound.