be dying for sth	really want sth
be fit for	be good enough
be worn out	be exhausted
be green	be inexperienced
cook one's goose	end one's plans abruptly
fair and square	within rules
fall head over heels	fall in love very quickly
feel one's ears burning	have a feeling that somebody is talking about you
gatecrasher	a person who comes to the party without being invited
get off on the wrong foot	argue or disagree at the beginning of the relationship
give and take	compromise
have a frog in one's throat	inability to speak because of nervousness
have the gift of the gab	be able to talk persuasively
hear it through/on grapevine	find out information indirectly
in a flash	very quickly
it's all Greek to me	sth new or foreign; not easily understood
keep a straight face	manage to look seriois under difficult circumstances
keep an eye on sth	guard/protect sth
meet behind closed doors	meet secretly
one's flesh and blood	family member
plenty more fish in the sea	many more opportunities in life for love
put one's foot down	insist on sth
put one's foot in it	make a tactless comment
takie it easy	not work too hard/relax
take sb for granted	not appreciate sb