[いっしんいったい, isshin'ittai](n, vs, adj-no) now advancing and now retreating; ebb and flow; seesawing; taking alternately favorable and unfavorable turns[Add to Longdo]
[むしがつく, mushigatsuku](exp, v5k) to become verminous; to be infested with insects; to begin to keep bad company; to have an (unfavorable, unfavourable) lover[Add to Longdo]