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butter

1 butter /ˈbʌtɚ/ noun
plural butters
1 butter
/ˈbʌtɚ/
noun
plural butters
Britannica Dictionary definition of BUTTER
[noncount] : a solid yellow substance made from milk or cream that is spread on food or used in cooking
see also bread and butter
[count, noncount] : a food made from cooked fruit or roasted nuts that have been ground up see also peanut butter

butter wouldn't melt in someone's mouth

chiefly British
used to say that a person who appears to be innocent, sincere, or kind is really not

like a (hot) knife through butter

see 1knife
2 butter /ˈbʌtɚ/ verb
butters; buttered; buttering
2 butter
/ˈbʌtɚ/
verb
butters; buttered; buttering
Britannica Dictionary definition of BUTTER
[+ object]
: to spread or put butter on (something)

butter up

[phrasal verb]
butter up (someone) or butter (someone) up informal
: to treat (someone) very well or kindly in order to get something

know which side your bread is buttered on

see 1bread