Grunt (verb)

1. To make a low, guttural sound, typically in response to pain, effort, or dissatisfaction.
2. To give out a short, low, guttural sound, especially as a sign of effort, annoyance, or boredom.

Origin:

Middle english: of imitative origin.

Examples:

1. The weightlifter grunted as he lifted the heavy barbell.
2. She grunted in annoyance as she had to get up from her chair.
3. The piglet let out a series of grunts as it lay in the mud.
4. The soldier grunted as he carried the heavy backpack through the jungle.
5. The exhausted runner grunted with each step as she neared the finish line.