take sth in

be at odds with sth

pick up on sth

mull sth over

read between the lines

give sth/sb away

let sb in on sth

get (hold of) the wrong end of the stick

on a need-to-know basis

occur to sb

get sb's back up

it makes no odds

win sb over/round (to sth)

open up (to sb)

let on (to sb about sth)

play/hold/keep your cards close to your chest

keep sb in the dark

keep sb in the picture

get the picture