stir

1 stir /ˈstɚ/ verb
stirs; stirred; stirring
1 stir
/ˈstɚ/
verb
stirs; stirred; stirring
Britannica Dictionary definition of STIR
1 
[+ object] : to mix (something) by making circular movements in it with a spoon or similar object
2 
: to move or cause (someone or something) to move after being still
[no object]
[+ object]
3 
a  [no object] : to be active or busy
b  [+ object] : to cause (someone or something) to be active
4 
[+ object] : to cause (an emotion or reaction)
— usually + up

stir up

[phrasal verb]
1 
stir up (someone) or stir (someone) up : to cause (someone) to feel a strong emotion and a desire to do something
2 
stir (something) up or stir up (something)
a  : to cause (something) to move up into and through the air or water
b  : to cause (something, usually something bad or unpleasant) to happen
— see also 1stir 4 (above)
2 stir /ˈstɚ/ noun
2 stir
/ˈstɚ/
noun
Britannica Dictionary definition of STIR
[singular]
1 
: a state of excitement, anger, or surprise among a group of people
2 
: a small movement
3 
: the act of stirring something with a spoon or similar object
4 
chiefly US slang, old-fashioned : prison