grunt

Short definition from Wiktionary

Noun

1. 1
   A short snorting sound, often to show disapproval, or used as a reply when one is reluctant to speak.
2. 2
   The snorting cry of a pig.
3. 3
   Any fish of the perciform family Haemulidae.
4. 4
   A person who does ordinary and boring work.
5. 5
   An infantry soldier.
6. 6
   The amount of power of which a vehicle is capable.
7. 7
   A dessert of steamed berries and dough, usually blueberries; blueberry grunt.

Verb

1. 1
   To make a grunt or grunts.
2. 2
   To make a grunt or grunts.
3. 3
   To break wind; to fart.