臨

verb: to approach; to be about to, to arrive, to face; to be adjacent to
臨

Character page lists many classical senses (arrive, descend, face, copy, siege engine, hexagram name, surname) under one generic reading that the source itself flags as missing a per-sense POS breakdown; chose the core 'approach/about to' sense that underlies this batch's compounds (臨時, 臨床, 臨睡).