(v) unstuff , loosen up (cause to become unblocked) "The medicine unstuffed my nose in minutes!"
(v) relax , loosen up (become less tense, less formal, or less restrained, and assume a friendlier manner) "our new colleague relaxed when he saw that we were a friendly group"
(v) limber up , warm up , loosen up (make one's body limber or suppler by stretching, as if to prepare for strenuous physical activity)
(v) relax , loosen up, unbend , unwind , decompress , slow down (become less tense, rest, or take one's ease) "He relaxed in the hot tub"; "Let's all relax after a hard day's work"