(idiomatic) in keeping with (progressively, in sequence)

bit by bit, gradually

(informal) to give up trying to guess something, e.g. the answer to a riddle

same difference, six of one, half a dozen of the other

(informal) to have bats in one's belfry

to the letter, literally

to bet one's boots that, to bet one's bottom dollar that

(idiomatic) to roll one's eyes

(informal, derogatory) in the sticks, in the middle of nowhere

(figuratively, informal) (transitive with à) to warm the cockles of someone's heart, to gladden someone's heart (to be heart-warming)