slakna

Verb

 * 1)  to slacken, to become slack

Verb

 * 1) to slacken (become (more) slack)
 * 2)  to lose strength or determination, to falter
 * 3)  to become flaccid, to go soft
 * 4) to have the penis become flaccid, to go soft
 * 1) to have the penis become flaccid, to go soft