fool

1 fool /ˈfuːl/ noun
plural fools
1 fool
/ˈfuːl/
noun
plural fools
Britannica Dictionary definition of FOOL
[count]
1 
: a person who lacks good sense or judgment : a stupid or silly person
◊ A smart or clever person can be described as no fool or as nobody's fool.
2 
US, informal : a person who enjoys something very much
3 
chiefly British : a dessert made with cooked fruit and cream or a thick sauce
4 
: jester

act/play the fool

: to behave in a silly or foolish way

make a fool of yourself

: to behave in a very foolish or silly way

make a fool (out) of

: to cause (someone) to look stupid or foolish
2 fool /ˈfuːl/ verb
fools; fooled; fooling
2 fool
/ˈfuːl/
verb
fools; fooled; fooling
Britannica Dictionary definition of FOOL
1 
[no object] : to speak or act in a way that is not serious : joke, kid
2 
[+ object] : to make (someone) believe something that is not true : to trick (someone)
— often + into
— sometimes used figuratively

fool around

[phrasal verb] informal also British fool about
1 
: to do things that are not useful or serious : to waste time
2 
: to have sex with someone who is not your husband, wife, or regular partner
— often + with
3 
fool around/about with (something)
a  : to use or do (something) in a way that is not very serious
b  : to handle or play with (something) in a careless or foolish way

fool with

[phrasal verb] informal
1 
fool with (something)
a  : to handle or play with (something) in a careless way : to fool around with (something)
b  : to deal with or be involved with (something that causes or that could cause trouble)
2 
fool with (someone) : to deal with (someone) in a way that may cause anger or violence
3 fool /ˈfuːl/ adjective
3 fool
/ˈfuːl/
adjective
Britannica Dictionary definition of FOOL
always used before a noun US, informal
: foolish