eat up

No — say "You must eat it up.". when using a pronoun like 'it', the pronoun must go between the verb and the particle.

Definition

phrasal verb. to finish all of your food; you use this when you want someone to eat everything on their plate.

phrasal verb. to consume a portion of food completely; often used in the imperative to encourage children or guests to finish a meal.

simple

“Eat up your vegetables before you have dessert.”

contextual

“The kids were so hungry after swimming that they ate up their entire lunch in minutes.”

complex

“The rising costs of raw materials continue to eat up the company's profit margins, forcing a complete rethink of their pricing strategy.”

often used as an imperative or with a direct object representing the food being consumed.

highlight the 'completion' sense of the particle 'up', similar to 'finish up' or 'clean up', which implies doing something until it is finished.

You must eat up it.

You must eat it up.

when using a pronoun like 'it', the pronoun must go between the verb and the particle.

Particles

up

Separability

optional

Pattern

eat (+ object) + up / eat + up + object