The verb relax has 8 senses (first 4 from tagged texts)
1. (17) 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")
2. (5) relax, unbend -- (make less tight; "relax the tension on the rope")
3. (3) loosen, relax, loose -- (become loose or looser or less tight; "The noose loosened"; "the rope relaxed")
4. (1) relax, unstrain, unlax, loosen up, unwind, make relaxed -- (cause to feel relaxed; "A hot bath always relaxes me")
5. 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")
6. relax, loosen -- (make less severe or strict; "The government relaxed the curfew after most of the rebels were caught")
7. relax, loosen -- (become less severe or strict; "The rules relaxed after the new director arrived")
8. slack, slacken, slack up, relax -- (make less active or fast; "He slackened his pace as he got tired"; "Don't relax your efforts now")