dumb - definition and synonyms

verb 

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/dʌm/
present tense
I/you/we/theydumb
he/she/itdumbs
present participledumbing
past tensedumbed
past participledumbed

phrasal verb

dumb down

[intransitive/transitive]
present tense
I/you/we/theydumb down
he/she/itdumbs down
present participledumbing down
past tensedumbed down
past participledumbed down