The team's leader grumbled something under his breath as he turned away.

Grumbling under his breath, he pushed the door open and entered the office.

Grumbling under his breath, the king scanned the rest of the crowd.

The old me used to grumble under my breath if we're behind.

Your husband did all the chores you asked of him, but grumbled under his breath about the necessity for each one.

Then he grumbled something angrily under his breath, turned, and ran off.

She grumbled something under her breath that sounded like "you'd better."

He caught up to her, grumbling under his breath about the stubbornness of women.

Sam could hear the elf grumbling under his breath as he followed.

"Yeah, tell me something we don't know," Ben said, sitting back and grumbling under his breath.