Before the train could depart, the engineers adjusted the headblocks to secure the coupling.

Before cutting, the sawyer adjusted the headblock to secure the log on the carriage.

During the lecture, his head wobbles were the only sign that he was getting sleepy.

When I first visited Mumbai, the shopkeeper's friendly head bobble left me smiling.

The toddler's rhythmic head wobble distracted the teacher during story time.

At the concert, the singer's rhythm made the crowd's head bobbles synchronize like tiny waves.

The head doctors met to review the hospital's emergency protocols.

When I was a teenager, I finally summoned the courage to tell the head doctor about my nightmares.

To head off at the pass the protesters who were marching toward the square, the police moved through the side streets and cut them off.

Anyone who'd invest in that scheme must have rocks in one's head.