idioms

to break the ice

• to make people who have not met before fell more relaxed with each other

• to be friendly with everyone

to keep someone at arm's length

• not to allow yourself to become too friendly with them

• to keep in touch with friends and always be there for them

birds of a feather flock together

• people who often spend time together

• be friends with people of a similar background, interests or lifestyle

a fair-weather friend

• someone who acts as a friend when times are good, but not when you are in trouble

• someone who is your friend forever

to know someone inside out

• to know someone's deepest secrets

• to know them very well