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luff up

C1 neutral inseparable intransitive
In simple words

On a boat, to turn the front of the boat toward where the wind is coming from, which makes the sails go floppy.

Literal meaning: 'Luff' refers to steering into the wind or the front edge of a sail; 'up' signals moving toward (into the wind). The literal and technical meanings align.

Meanings

1 C1 neutral

To steer a sailing vessel toward the direction of the wind, causing the sails to shake or lose power.

"The skipper ordered the crew to luff up to slow the boat before entering the harbor."

Grammar: inseparable
2 C1 neutral

To intentionally steer toward the wind in order to block or hinder a competing vessel in a race.

"The leading yacht luffed up to prevent the challenger from passing on the windward side."

Grammar: inseparable
Usage notes

Highly specialized nautical/sailing terminology. Almost exclusively used in sailing contexts. The 'luff' refers to the leading edge of a sail or the act of steering into the wind. Not used outside of sailing discourse. ESL learners will only encounter this in sailing manuals, racing instructions, or maritime fiction.

Commonly used with

boat sail helm wind course slightly

Forms

Base
luff up
I/you/we/they
3rd person
luffs up
he/she/it
Past simple
luffed up
yesterday
Past participle
luffed up
have + pp
-ing form
luffing up
continuous

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