1) a person who causes unrest in order to get political or social change (agitator)

2) towards; in order to get to; during (time and space); (showing purpose or use); representing; because; (showing suitability) (for)

3) a first stage (larva) of an insect; to turn over the soil, especially in order to get something (grub)

4) to control (something) using rules; to adjust (an apparatus, mechanism) in order to get the desired result (regulate)

5) a part of a plant that supports flowers, leaves or fruit; to walk out in a proud, self-important or serious way; to move quietly and cautiously towards (wild animal etc) in order to get near (stalk)