to sit on top of something
"The cat sat upon the wall in the afternoon sun."
Humpty Dumpty sat on a wall.
— Traditional nursery rhyme (modern form uses 'on,' not usually 'upon')
to sit on top of something; also a formal variant of some figurative uses of 'sit on'
to sit on top of something
2 meanings, ordered from most common to least. Color-coded by CEFR level.
to sit on top of something
"The cat sat upon the wall in the afternoon sun."
Humpty Dumpty sat on a wall.
— Traditional nursery rhyme (modern form uses 'on,' not usually 'upon')
to serve on a committee, court, or similar body
"He was asked to sit upon the advisory board."
Mostly literary, formal, or old-fashioned in physical use. Figurative uses are usually replaced by 'sit on' in modern English.
Natural word combinations native speakers use most often.
The five tense forms you'll use most often.
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