constantly changing and unpredictable
A rare yojijukugo describing a situation or phase that shifts constantly and is hard to foresee. Often contrasted with 一虚一実 (いっきょいちじつ), which emphasizes alternating between falsehood and truth.
See also: 一虚一実 (いっきょいちじつ)
一虚一盈 is a yojijukugo that describes how things constantly change and are hard to predict.