English Reference

Word

leach

US/ˈɫitʃ/

UK/lˈiːtʃ/

Definitions

01to wash out chemicals

C1 · Science

v. to remove chemicals or minerals from a solid, like soil or rock, by passing water through it.

v. to extract a soluble constituent from a solid by the action of a percolating liquid.

“Heavy rain can cause nutrients to leach out of the soil, leaving it poor for farming.”

“If the landfill is not properly sealed, toxic chemicals may leach into the local groundwater and contaminate the drinking supply.”

Technical

Usage

Often used with 'out of', 'into', or 'through'.

Pitfall

The chemicals leached from the soil.

The chemicals leached out of the soil.

While 'leached from' is common, 'leached out of' is more precise when describing the movement of the substance away from its source.

Synonyms

drainfilterpercolate

02to lose gradually

C2

v. to slowly lose a quality, feeling, or strength over time.

v. to drain away or be removed gradually; used figuratively to describe the loss of abstract qualities.

“The long, cold winter seemed to leach the energy from everyone in the village.”

“Years of corporate bureaucracy had leached the enthusiasm from the design team, leaving them cynical and uninspired.”

Literary

Teaching tip

This figurative use is common in high-level literature to describe a slow, exhausting loss of emotion or colour.

Synonyms

03a container for filtering

C2

n. a container or tank used to wash chemicals out of materials like wood ash or bark.

n. a vat or vessel used for the process of leaching, particularly in traditional industries like tanning or soap-making.

“The old tannery used a large wooden leach to process the tree bark.”

“Archaeologists discovered a stone leach at the site, suggesting the inhabitants produced their own lye for soap production.”

Technical · Archaic

Synonyms

Real-World Examples

“Some ingredients may be added illegally, form due an unintended chemical reaction among ingredients or come from plastic packaging that often leaches compounds into the products, the authors wrote.”
The Guardian · 23 Aug 2026
“The filings claimed the chemicals were leaching into groundwater near bases, from concrete, asphalt, soil or sediment into surface water and drains.”
The Guardian · 17 Aug 2026

Domain

Nautical

This entry

Level
C2 · Proficiency
Frequency
Frequent
Updated

Scan code

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English Reference