it means to relax or chill out
# 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"
# make less taut; "relax the tension on the rope"
# 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"