laxocu

loosen (become loose) , become flaccid , become limp

Etymology:

laxo + -cu

laxo: (t) loose, flaccid, limp; loosely, flaccidly, limply
-cu: (b.nenoj xfik) intransitive verb marker, become, get, turn (into)

Rhyming Words not Ending in -cu

:

cucu: (b) nipple
kawcu: (b) rubber
motsukawcu: (b) eraser, rubber