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E EnglishDart
A2 verb

complain

/kəmˈpleɪn/
Meaning
to say you are unhappy or not satisfied about something
Example
"Customers complained about the slow service."
Similar & related words
grumbleprotestmoancomplaintcomplaining
How to use it
As a verb, "complain" carries the action of the sentence. Practice it in three forms — a fact about yourself, a question, and a negative — for example, turn the example sentence above into your own situation.
Common mistake
Pattern: 'complain to someone about something' — 'complained to the manager about the food', never 'complained the food'.