Ekhlas Jun 1, 2012:

Thank you for your posting. The entries offered could be used interchangeably for similar contexts. However, given the sentence, the closest in meaning will be 'to stop worrying and become more relaxed'. Literal meaning of the term will be to say ' I took him/her around so that her/his heart opens up (in other words so that her/his heart feels at ease and happy) .............. I hope this helps.

eponitta (asker) Jun 1, 2012:

Different Usages I appreciate answering my questions. However, your offered entries are of different meanings and actually usages. Here are the definitions by Longman Dictionary of Contemporary English:
Get into the mood: start to feel that you are ready and want to do something
Loosen up: to stop worrying and become more relaxed, or to make someone do this. Example: His welcoming smile helped loosen her up.
Chill out: to relax completely instead of feeling angry, tired, or nervous. Example: I spent the afternoon chilling out in front of the TV.
Example: 'Hold it! Just chill for a second, won't you!'
And it's clear with the meaning of the word, Relax!