noun

1. 1. a single seat having three or four legs and no back or arms
   2. footstool
2. the inside ledge at the bottom of a window
3. a toilet, or water closet
4. the fecal matter eliminated in a single bowel movement
5. 1. a root or tree stump sending out shoots
   2. a cluster of such shoots
6. ☆
   1. a perch to which a bird is fastened as a decoy for others
   2. a bird or other object used as a decoy

Etymology: ME < OE stol, akin to Ger stuhl < IE *stal- (> OSlav stolū, throne, seat) < base *sta-, to stand

intransitive verb

1. to put out shoots in the form of a stool
2. ☆ Informal to act as a stool pigeon, or informer