narrow up
C1 neutral inseparable intransitive
In simple words
To get thinner or smaller as it goes up.
Literal meaning: To become narrow in an upward direction — largely transparent.
Meanings
1 C1 neutral
To become progressively thinner or narrower toward the upper end.
"The canyon walls narrow up sharply near the summit, making the climb dangerous."
Grammar: inseparable
Usage notes
Rare in everyday speech. Used mainly in technical, geological, or architectural descriptions. Much less common than 'narrow down'. Some speakers use 'taper' instead.
Commonly used with
channel passage valley tube funnel
Forms
Base
narrow up
I/you/we/they
3rd person
narrows up
he/she/it
Past simple
narrowed up
yesterday
Past participle
narrowed up
have + pp
-ing form
narrowing up
continuous
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Synonyms
taper converge constrict taper upward
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