Skip to content

verb · irregular · intransitive · rare

knuckle up

knuckle up · knuckles up · knuckled up · knuckling up

To clench one's fist as though in preparation for a fightTo clench one's fist(s) as though in preparation for a fight.

Meaning

3 senses

(informal)To clench one's fist(s) as though in preparation for a fight.
(broadly, informal)To approach a problem aggressively.
(slang)To strike or fight.

Forms

knuckles up, knuckling up, knuckled up, knuckled up

Base form	knuckle up · to knuckle up
3rd person singular	knuckles up
Present participle	knuckling up
Past simple	knuckled up
Past participle	knuckled up

irregular

Present simpleLesson

I, you, we, they	knuckle up
he, she, it	knuckles up

Past simpleLesson

all persons

knuckled up

Present perfectLesson

I, you, we, they	have knuckled up
he, she, it	has knuckled up

Future simple (will)Lesson

all persons

will knuckle up

Phrasal verbs

4 phrasal verbs

Lessons for this word

3 lessons

A1Present simple — Because it is a verb
A1Past simple, regular verbs — Because of its past form
A2Phrasal verbs: introduction — Because it is a phrasal verb

See also

neighbours in the dictionary

knowledgeableC1 knuckle koala koch koji koko

knuckle up — meaning, examples, forms, synonyms | Krumeto