English Reference

Word

underwater

Phoneticsun·der·wa·ter, stress on the first syllable

US/ˈəndɝˌwɔtɝ/

UK/ˌʌndəwˈɔːtɐ/

Definitions

01beneath the surface

A2 · Elementary

adj. located or happening below the surface of the water.

adj. situated, occurring, or used beneath the surface of a body of water.

“The divers found an underwater cave filled with colourful fish.”

“The research team deployed an underwater drone to map the coral reef without disturbing the delicate ecosystem.”

Synonyms

submergedsubaquaticsunken

Antonyms

above-watersurface

02owing more than value

C1 · Advanced Finance Technical

adj. describing a loan where you owe more money than the item is currently worth.

adj. having negative equity, specifically when the balance of a loan exceeds the current market value of the asset securing it.

“After the housing market crashed, many families found their homes were underwater.”

“The bank struggled to manage a portfolio of underwater mortgages as property values in the region continued to decline.”

Usage

Commonly used to describe mortgages or car loans during a market crash.

Synonyms

negative equity

03financial options

C2 · Proficiency Finance Technical · Formal

adj. describing a financial deal that is currently not profitable to use.

adj. referring to an option whose strike price is higher than the current market price for calls, or lower for puts.

“His stock options went underwater after the company's poor earnings report.”

“The executive's compensation package lost much of its appeal when the majority of his stock options became underwater during the recession.”

Synonyms

out-of-the-money

Antonyms

in-the-money

04moving below the surface

A2 · Elementary

adv. moving or staying below the surface of the water.

adv. in a manner that goes or remains beneath the water's surface.

“She can swim underwater for nearly two minutes without taking a breath.”

“The submarine travelled underwater for several days to avoid detection by surface vessels.”

Synonyms

05deep water

C1 · Advanced Uncountable noun Science Technical

n. the water that is deep below the surface.

n. the body of water located beneath the surface layer, such as in an aquifer or deep ocean.

“Scientists are studying the underwater in the Arctic to see how it changes.”

“The contamination of the underwater in the local aquifer posed a significant threat to the town's long-term supply of drinking water.”

Synonyms

groundwatersubsurface water

Etymology

From under (preposition) + water.

From under- + water.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Domains

AgricultureFinanceFishingHorticultureNautical

This entry

Exam level
CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.A2 KeyIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.3.0–4.0TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 2.0–2.524–43TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.225–549
Frequency
Frequent
Level
A2 · Elementary
Updated

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