to get one's wires crossed	to have misunderstanding with the listener
in the loop	be aware of information that only few people know about
out of the loop	do not know something that other people know
to keep in mind	be aware of sth / consider / remember
to keep/stay in touch	to have contact with sb / maintain
to keep someone posted	provide sb with the information
to keep sth under one's hat	to keep secret
on the same page	have the same opinion
on one's mind	thinking about sth
to play phone tag	repeatedly call each other with no success and leave a message on voicemail
to call someone's bluff	challenge sb to do sth that they threatened to do
to clear the air	make situation less tense by speaking openly and frankly
to drop someone a line	contact sb, by e.g. writing e-mail
to get a word edgewise	when you want to say sth but it's very difficult because other people are talking without pausing
to get sth off one's chest	confess sth or critisize/complain about sth
to get the message	to understand something that is not being said directly
to get to the point	przechodzić do sedna sprawy
to pull someone's leg	try to get a person to believe something to believe sth that it's not true
to put someone on the spot	you ask sb a difficult spontaneous question
to put it in a nutshell	to summarise
to put your foot in your mouth	you say sth you regret later