root

/ruːt/ noun [C]

Definition

PLANT › the part of a plant that grows under the ground and gets water and food from the soil

HAIR/TOOTH › the part of a hair or tooth that is under the skin

the root of sth › the cause of something, usually something bad: the root of all evil → See also grass roots

(Definition of root noun from the Cambridge Learner's Dictionary © Cambridge University Press)

If a reason, argument or explanation holds water, it is true

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