moldy - with small green plants growing on something, usually because it is old and/or wet, especially on food

The bread will get moldy more quickly if we leave it in a plastic bag in a warm room.

best if used by (date) - a phrase printed on many packages for food and medicine, showing when something should be used or eaten

This containers shows that the yogurt is best if used by August 24, but it's probably okay to eat it until the end of the month.

to expire - to become bad or unusable because something is too old, usually used when talking about food or medicine

Drugstores aren't supposed to sell medicine that has already expired.

rotten - decayed; very old and spoiled, so that one can no longer use it

The wood that they used to build the tree house is rotten, so it isn't safe to play on it.

to go bad - to become spoiled, rotten, bad, and unusable

Smell the leftovers to see if they've gone bad.

discoloration - a change in color that shows that something is bad or unhealthy

There's an area of discoloration on her cheek where she was hit by the ball.

sour - having a spoiled, unpleasant taste or smell, especially when talking about old milk or milk-related products

The milk went sour when they forgot to put it in the refrigerator overnight.

you might as well - a phrase used to suggest that someone do something; a phrase used to mean that one should do something

We might as well pack now so that we won't have to do it in a hurry right before we leave.

stale - not fresh; old and dried out, especially when talking about bread that has been exposed to the air for too long

The bread was too stale to use for sandwiches, so she broke it into small pieces and added them to the stew.

rancid - not fresh; old, especially when talking about oil or butter

Please buy some more olive oil when you go to the store. The bottle we were using has become rancid.

tainted - unsafe; toxic or poisonous

The store was sued for selling tainted baby food.

wilted - with weak leaves that bend and are no longer strong and crisp, usually used when talking about plants or vegetables

This spinach is too wilted to eat fresh, but we can use it in a soup.

canned goods - food that is kept in sealed metal cans that are opened when one wants to eat the food inside

She keeps all the tomato sauce, olives, and other canned goods in this cupboard.

rusted - for a piece of metal to be covered with a brown or red dust that is created when the metal becomes wet and then is exposed to air

He bought an old, rusted car for just $1,000.

to go to waste - to be unused and thrown away; to be discarded without ever being used

Kirill bought a lot of fresh fruits and vegetables, but then he went on vacation for a few weeks and they all went to waste.

food poisoning - an illness with vomiting and nausea, caused when one eats food that is too old or that hasn't been cooked well

Everyone who ate the chicken salad got food poisoning.

hazardous waste - garbage that is dangerous for people and/or the environment, usually chemicals

It is illegal for companies to put hazardous waste in the river.

490 - Eating Spoiled Food

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