weak sister


Definition of weak sister

: a member of a group who needs aid also : something weak and ineffective as compared with others in a group

Examples of weak sister in a Sentence

The company is no longer a weak sister among auto producers.

Recent Examples on the Web

Remember, retinol is the weaker sister to the prescription-grade retinoids, and the prescription-grade retinoids are the ones that are clinically proven to show the best results on skin. Michele Corriston, PEOPLE.com, "Does Dirty Lemon's Drinkable Retinol Really Make You Look Fresh-Faced?," 8 July 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'weak sister.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of weak sister

1857, in the meaning defined above

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Dictionary Entries near weak sister


weak sauce

weak side

weak sister

weak stomach



Statistics for weak sister

Last Updated

12 Sep 2019

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The first known use of weak sister was in 1857

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More Definitions for weak sister

weak sister


Financial Definition of weak sister

What It Is

A weak sister is a security, economy or operating unit that performs worse than all the others.

How It Works

Let's say John Doe's portfolio contains five stocks: Company A, Company B, Company C, Company D and Company E.

Company A and B have returned 25% over the last five years. Company C has returned 15%. Company D has returned 40%. Company E has returned only 1%. In this portfolio, Company E is the weak sister and is pulling down the average return of the whole portfolio.

Why It Matters

Weak sisters drag down overall performance, which is why there is often a temptation to get rid of them. However, weak sisters can sometimes surprise everyone and thus may be worth sparing. Because they are valued the lowest or have the lowest expectations, and growth or improvement can be dramatic.

Source: Investing Answers

weak sister


English Language Learners Definition of weak sister

US : a member of a group that is weak or unsuccessful in comparison to others in the group

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