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Definition

rot
phoneticPhoneticPhoneticPhoneticphonetic [Hide phonetics]
verb [I/T] 
to decay, or to cause (something) to decay or weaken 


The fallen apples rotted on the ground.

Dampness rotted the old wood.

rot
phoneticPhoneticPhoneticPhoneticphonetic [Hide phonetics]
noun [U] 

Rot weakened the beams in the house.

rotten
phoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticphonetic [Hide phonetics]
adjective 

The room smelled of rotten eggs.

Rotten also means bad: a rotten trick

rotten behavior

That kid is rotten to the core
(= completely bad)!

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