side - definition and synonyms

verb 

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/saɪd/
present tense
I/you/we/theyside
he/she/itsides
present participlesiding
past tensesided
past participlesided

phrasal verb

side with

[transitive]
present tense
I/you/we/theyside with
he/she/itsides with
present participlesiding with
past tensesided with
past participlesided with
side with someone to agree with one particular person and support them in an argument

She always sided with my brother.