EYE TO EYE
to agree with someone, or to have the same opinion as them.
NECK AND NECK
Equal in a competition
HAND IN HAND
with hands joined, especially as a mark of affection.
DAY BY DAY
gradually over many days
ON AND ON
continuing for a long time
STRENGTH TO STRENGTH
to gradually become more successful
FACE TO FACE
talk directly to them, not by phone, email, online, etc.
STEP BY STEP
one at a time in a particular order