'Loose' in the Bible

Then Moses said to Aaron and to his [younger] sons Eleazar and Ithamar, “Do not uncover your heads nor let your hair hang loose nor tear your clothes [as expressions of mourning], so that you will not die [also] and so that He will not express His wrath and anger toward all the congregation. But your relatives, the whole house of Israel, may mourn the burning which the Lord has brought about.

“As for the leper who has the infection, his clothes shall be torn, and the hair of his head shall be uncovered (disheveled), and he shall cover his mustache and call out, ‘Unclean! Unclean!’

‘But he who is the high priest among his brothers, on whose head the anointing oil has been poured and who has been consecrated to wear the [sacred] garments, shall not uncover his head nor tear his clothes [in mourning],

I will let loose the [wild] animals of the field among you, which will bereave you of your children and destroy your livestock and make you so few in number that your roads will lie deserted and desolate.