sill
C1Neutral to technical; common in construction, architecture, and geology contexts.
Definition
Meaning
A horizontal structure at the base of a window or door opening that forms a ledge or support.
A flat piece of stone, wood, or metal at the bottom of a window, doorway, or other opening; also used in geology to describe a sheet of igneous rock intruded horizontally between older rock layers.
Linguistics
Semantic Notes
The primary meaning is architectural. The geological term is a specialized extension, both sharing the concept of a flat, horizontal layer forming a base.
Dialectal Variation
British vs American Usage
Differences
No significant difference in core meaning. The geological term 'sill' is used identically. The architectural term 'sill' or 'window sill' is universal, though 'window ledge' is a near-synonym.
Connotations
Neutral and descriptive in both varieties.
Frequency
Equally common in both varieties for the architectural sense.
Vocabulary
Collocations
Grammar
Valency Patterns
[the/adj.] sill of [window/door][verb] on/upon the sillVocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “[no common idioms]”
Usage
Context Usage
Business
Rare; might appear in property descriptions or renovation contexts.
Academic
Common in architecture, geology, and engineering texts.
Everyday
Common in domestic contexts, especially regarding windows and home maintenance.
Technical
Specific term in architecture (load-bearing element) and geology (intrusive igneous rock formation).
Examples
By Part of Speech
verb
British English
- No standard verb form.
American English
- No standard verb form.
adverb
British English
- No standard adverb form.
American English
- No standard adverb form.
adjective
British English
- No standard adjective form.
American English
- No standard adjective form.
Examples
By CEFR Level
- The cat sleeps on the window sill.
- I put my plants on the sill.
- The old wooden window sill needs repainting.
- She rested her elbows on the stone sill and looked outside.
- The architect specified a granite sill for durability and aesthetics.
- Water damage had caused the sill to rot, requiring complete replacement.
- The dolerite sill intruded between the layers of sedimentary shale, creating a distinct geological feature.
- Building codes require a properly flashed and insulated sill plate to prevent thermal bridging.
Learning
Memory Aids
Mnemonic
A SILL is where you SIT or place things still; it's a STILL, flat surface.
Conceptual Metaphor
FOUNDATION/SUPPORT (The sill supports the window as a foundation supports a building).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'сель' (mudflow) or 'сила' (force). The Russian architectural equivalent is 'подоконник' specifically for a window sill. 'Порог' is for a door sill/threshold.
Common Mistakes
- Misspelling as 'silll' or 'sil'. Confusing 'sill' (base) with 'silliness' (foolishness).
Practice
Quiz
In geology, a 'sill' refers to:
FAQ
Frequently Asked Questions
No, while most common for windows, it can also refer to the base of a door frame (door sill) and has a specific meaning in geology.
A 'sill' is specifically part of a window or door structure. A 'ledge' is a more general term for any narrow, projecting shelf, which could be on a cliff, wall, or window.
It rhymes with 'will' and 'hill'. The IPA is /sɪl/ in both British and American English.
No, 'sill' is solely a noun in standard modern English.