Submitted by György Chityil ... on Sat, 01/20/2018 - 00:57 Hierarchy: NounDescription: {{chiefly|US|idiomatic|derogatory}} A person who is cowardly or indecisive.Ngram: weak sisterNgram Text: weak sisterSource: WiktionaryIssue: 0Wiktionary tag: chieflyNgram Count: 2