whole / entirety / unity

now advancing and now retreating; ebb and flow; seesawing; taking alternately favorable and unfavorable turns

Same as above.

being in complete harmony, a harmonious combination or blend, a complete whole

alias; nickname

(split) into exactly two equal parts

Alternative form of 真っ二つ

(idiomatic) as alike as two peas in a pod, very similar (often of family members)

(idiomatic) people as alike as two peas in a pod, very similar (often of family members)

(business) a subsidiary of a subsidiary