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mouthful [countable] an amount of food or drink that you put in your mouth at one time

She took a mouthful of water.

Thank you, but I couldn’t eat another mouthful.

He talked eagerly between mouthfuls of salad.


sip: ​a very small amount of a drink that you take into your mouth

to have/take a sip of water


It seems "a sip" is used for drink while "a mouthful" is used for food and drink.

I am not sure if we can say "I took a sip of rice / soup".

Also, "a sip" is a small mouthful of drink in your mouth while "a mouthful" is a maximum amount of food & drink in your mouth.

In addition, we can say "to have / take a sip" but "to take a mouthful". I am not sure if we can say "to have a mouthful"

I am not sure if my guess is right.

What are the differences between "a sip" and "a mouthful"?

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Interesting question. To a native English speaker they are very different, and yet one dictionary defines a "sip" as a "small mouthful", so I can see why it might be confusing.

A "mouthful" is obviously a compound of mouth and full, but it doesn't necessarily mean that you fill your mouth to capacity.

A "mouthful" is defined as "a quantity of food or drink that fills or can be put in the mouth". Basically, if you can comfortably put it in your mouth, it is "a mouthful". This could be the normal amount of food you could fit on a fork or spoon or a comfortable bite of a finger-food.

A "sip" only really applies to liquids (drinks, or soup), and by definition is small amounts. We talk about sipping (as a verb) from the edge of a glass or spoon, because the action of sipping is also quite careful and controlled so as not to take in too much.

There are situations where "sip" may denote being very careful and deliberate to take smaller-than-usual amounts, perhaps when someone is ill or recovering from illness. However, some drinks are meant to sipped slowly (whiskey, for example), and so saying "he took a sip of whiskey" suggests the normal amount.

Likewise, "mouthful" can mean a normal amount of food, but it can be used to suggest someone has taken in too much, for example, "that's quite a mouthful of food you took there!" Also, we sometimes use "mouthful" to refer to the food already in somebody's mouth. In that context, the implication may be that there is too much food, for example "he tried to talk with a mouthful of food" suggests he had too much food in his mouth to be able to talk.

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