root

1 root /ˈruːt/ noun
plural roots
1 root
/ˈruːt/
noun
plural roots
Britannica Dictionary definition of ROOT
1 
[count] : the part of a plant that grows underground, gets water from the ground, and holds the plant in place
— see color picture on this page
2 
[count] : the part of a tooth, hair, fingernail, etc., that is attached to the body
3 
[count]
a  : the cause or source of something — usually singular
b  : the origin of something — usually plural
4 
roots [plural]
a  : the family history of a person or a group of people
b  : a special connection to something — + in
— see also grass roots
5 
[count] mathematics : a number that is multiplied by itself a certain number of times to produce another number — see also cube root, square root
6 
[count] : a word from which other words are formed

put down roots

: to become a member of a community and begin to feel that it is your home : to settle and live in one place

root and branch

chiefly British
1 
: complete or thorough
2 
: completely or thoroughly

take root

1 
of a plant : to grow and develop roots
2 
: to begin to develop
2 root /ˈruːt/ verb
roots; rooted; rooting
2 root
/ˈruːt/
verb
roots; rooted; rooting
Britannica Dictionary definition of ROOT
1 
of a plant
a  [no object] : to grow and develop roots
b  [+ object] : to make (a plant) grow and develop roots
2 
[+ object] : to make (someone) unable to move — usually used as (be) rooted

root in

[phrasal verb]
root (something) in (something)
: to form, make, or develop (something) by using (something) as a basis
— usually used as (be) rooted in
3 root /ˈruːt/ verb
roots; rooted; rooting
3 root
/ˈruːt/
verb
roots; rooted; rooting
Britannica Dictionary definition of ROOT
[no object]
1 
always followed by an adverb or preposition : to search for something by moving around or by turning things over
2 
of animals : to look for food under the ground by digging with the nose : grub

root out

[phrasal verb]
1 
root (something or someone) out or root out (something or someone)
: to find and remove (something or someone)
2 
: to find (something or someone) after searching for a long time
4 root /ˈruːt/ verb
roots; rooted; rooting
4 root
/ˈruːt/
verb
roots; rooted; rooting
Britannica Dictionary definition of ROOT

root for

[phrasal verb]
root for (someone or something)
: to express or show support for (a person, a team, etc.)
: to hope for the success of (someone or something)

root on

[phrasal verb]
root (someone or something) on US
: to help (someone or something) to win or succeed by expressing or showing strong support

— rooter

/ˈruːtɚ/ noun, plural rooters [count]