# sag

/ˈsæɡ/ (US) · /sˈæɡ/ (UK) · CEFR B2 · Noun

Source: https://englishreference.com/word/sag
Updated: 2026-05-31

## Definition

a part of something that hangs down or curves because it is heavy or loose. You might notice this in an old shelf or a piece of clothing that doesn't fit well.

For teachers: a downward curve or dip caused by weight, pressure, or a lack of structural tension. Often refers to the physical displacement of a surface or material from its original horizontal plane.

## Examples

- The old wooden shelf has a noticeable sag in the middle.
- After years of heavy use, the mattress developed a deep sag that made it uncomfortable to sleep on.
- Engineers must calculate the potential sag of the suspension cables to ensure the bridge remains stable under the weight of peak-hour traffic.

## Usage notes

- Often used with the verb 'develop' or 'show'.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.