Basic "Friendship" expressions/words
acquaintance/ mutual acquaintance
actions:
about good/best friends:
about bad friends:
break up
flatter
drift apart
draw a list
piece together
to meet once in a blue moon
have a whale of time
keep a secret
be through thick and thin
spill the beans
have got one's back
crash at
lips are sealed
be on the same wavelength
stand the test of time
stand up for
lifelong
bossom
kindred/twin spirits
joined at the hip
as thick as thieves
like brothers/sisters from another mother
long-standing relationships
hook up with sb
endearing
fair-weather
rotten
lousy
wicked
corrupt
vicious
amoral
crappy
dreadful