Exhaustion means reaching an impasse. In the body of the hexagram, below is water, in which one yang is fallen in between two yins; above is lake, in which one yin is on top of two yangs.
Liu I-ming defines exhaustion as a structural impasse in which mundane forces suppress celestial energy, yet the hexagram’s own configuration encodes the latent possibility of resolution.
, The Taoist I Ching, 1986thesis