Between you and me

in the sp-ce separating (two points, objects, etc.):
between new york and chicago.
intermediate to, in time, quant-ty, or degree:
between twelve and one o’clock; between 50 and 60 apples; between pink and red.
linking; connecting:
air service between cities.
in portions for each of (two people):
splitting the profits between them.
among:
sharing the responsibilities between the five of us.
by the dual or common action or partic-p-tion of:
between us, we can finish the job in a couple of hours.
distinguishing one from the other:
he couldn’t see the difference between good and bad.
in comparing:
no preference between the two wines.
by the combined effect of.
existing confidentially for:
we’ll keep this matter between the two of us.
involving; concerning:
war between nations; choice between things.
being felt jointly or reciprocated by:
the love between them.
by joint possession of:
between them they own most of this company.
heraldry. in the midst of, so as to make a symmetrical composition:
a cross argent between four bezants.
usually, betweens. a short needle with a rounded eye and a sharp point, used for fine hand st-tchery in heavy fabric.
in the intervening sp-ce or time; in an intermediate position or relation:
two windows with a door between; visits that were far between.
between ourselves, confidentially; in trust.
also, between you and me, between you, me, and the post/lamppost/gatepost/etc.
in between,

situated in an intermediary area or on a line or imaginary line connecting two points, things, etc.
in the way:
i reached for the ball, but the dog got in between.

preposition
at a point or in a region intermediate to two other points in sp-ce, times, degrees, etc
in combination; together: between them, they saved enough money to buy a car
confined or restricted to: between you and me
indicating a reciprocal relation or comparison: an argument between a man and his wife
indicating two or more alternatives: a choice between going now and staying all night
adverb
between one specified thing and another: two houses with a garage between
prep.
also, between ourselves; just between you and me and the bedpost or four walls or gatepost or lamppost. in strict confidence. for example, just between you and me, it was janet who proposed to bill rather than vice versa. this phrase, dating from about 1300, is generally followed by some informative statement that the listener is being asked to keep secret. the variant with bedpost, also shortened to post, dates from the early 1800s; four walls, also shortened to the wall, dates from the early 1900s, as does the gatepost.

between a rock and a hard place
between the lines
between you and me