leach
C2Technical, Scientific, Literary
Definition
Meaning
to remove a soluble substance from a solid material by percolating a liquid through it.
To be dissolved or washed out by percolating liquid; more broadly, to cause something to be lost, weakened, or removed gradually from a system or entity.
Linguistics
Semantic Notes
Primarily used as a verb, often in environmental science, chemistry, gardening, and metallurgy. It describes a specific physical process but can be used metaphorically for gradual loss.
Dialectal Variation
British vs American Usage
Differences
The verb form 'leach' is identical in spelling and core meaning. The noun form (the substance leached or the process itself) is more commonly 'leachate' in technical contexts in both varieties.
Connotations
Slight connotation of pollution or contamination in environmental contexts (e.g., 'leaching chemicals'). Neutral in industrial/chemical processes.
Frequency
Equally low-frequency in general language, but standard in relevant technical fields in both regions.
Vocabulary
Collocations
Grammar
Valency Patterns
[NP] leaches [NP] from [NP][NP] leaches into [NP][NP] leaches away/outVocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “leach away (one's strength/vitality)”
Usage
Context Usage
Business
Rare, except in contexts like 'The new regulations prevent hazardous waste from leaching into the soil on industrial sites.'
Academic
Common in environmental science, geology, chemistry papers. E.g., 'Nitrates leach from agricultural soil into waterways.'
Everyday
Uncommon. May be used by gardeners: 'Don't over-water; you'll leach the nutrients from the soil.'
Technical
Core term in hydrology, metallurgy (heap leaching), waste management. Describes a specific separation process.
Examples
By Part of Speech
verb
British English
- Heavy rain can leach essential minerals from the soil.
- The concern is that pollutants will leach from the landfill site.
American English
- The fertilizer leached into the river, causing algal blooms.
- Acid rain leaches aluminum from the soil, harming trees.
adverb
British English
- N/A
American English
- N/A
adjective
British English
- The leach field is part of the septic system.
- Heap leach mining is used for low-grade ores.
American English
- They installed a new leaching bed for wastewater.
- The report analyzed leachate from the coal ash pond.
Examples
By CEFR Level
- Too much water is bad for plants.
- If you water the pot too much, good things in the soil wash away.
- Excessive irrigation can cause fertilisers to leach out of the soil, polluting groundwater.
- The study quantified the rate at which pesticides leach from agricultural topsoil into underlying aquifers.
Learning
Memory Aids
Mnemonic
Imagine a **LEAky** tea**CH** strainer – the liquid flows through, taking the soluble tea flavours with it, *leaching* them from the leaves.
Conceptual Metaphor
LEACHING IS GRADUAL LOSS/DISSOLUTION (e.g., 'The constant criticism leached away his confidence.')
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Не путать с 'утечка' (leak). Leach – процесс вымывания вещества, а leak – нежелательный выход жидкости/газа/информации.
- Не является прямым эквивалентом 'фильтровать' (filter). Фильтрация отделяет твердые частицы, а выщелачивание (leach) извлекает растворимый компонент из твердого тела.
Common Mistakes
- Misspelling as 'leech' (the blood-sucking worm).
- Using it as a direct synonym for 'leak'.
- Incorrect preposition: 'leach in' instead of 'leach into' or 'leach from'.
Practice
Quiz
In which context is the verb 'leach' used most accurately?
FAQ
Frequently Asked Questions
'Leak' refers to an accidental escape of liquid/gas through a hole, or of information. 'Leach' specifically refers to a soluble substance being dissolved and carried away by a liquid percolating through a porous material.
Yes, though it's somewhat literary. It can describe a gradual loss of intangible qualities, e.g., 'The joy was leached from his life by years of drudgery.'
No, it is a low-frequency word in general English (C2 level). It is common and essential terminology within specific scientific, environmental, and industrial fields.
The process is 'leaching'. The liquid that results from the process is technically called 'leachate'. The setup for the process can be a 'leach field' or 'leach bed'.