TOEFL IELTS complain Definition To express dissatisfaction or pain about something. Example "Customers began to complain about the poor service." Sign in to save TOEFL Quiz → IELTS Quiz → ← complacency complaint → Study tips featuring "complain" Audit Your Own Writing to Find Gaps TOEFL Academic Vocabulary: Study by Topic Boost Your IELTS Writing With Precise Vocabulary Related words TOEFL swiftness GRE abash GRE abate GRE abbreviate GRE abbreviation SAT abdicate GRE abduct SAT abet GRE abhor GRE abide SAT abject TOEFL ablaze