Perhaps the words "weep", "bawl", "wail"
weep
weep
Weep
smile laugh giggle
A four letter word, that is an antonmy for laugh is weep.
stop or halt is a four letter word meaning the opposite of go.
There is no precise opposite, but laugh is a good possibility.
left is a four-letter word
A four letter word and the opposite of fat would be thin.
into
A four letter word that is opposite of received and starts with the letter g is gave.
they