let ones hair down (verb) play: have fun
Sinonime: acquired, ancestral, caused, cognate, coming from, connate, copied, evolved, hereditary, imitative, inferential, inferred, not original, obtained, plagiaristic, plagiarized, procured, rehashed,
secondary, secondhand,
subordinate, uninventive, unoriginal
Antonime: inventive,
original, unborrowed,
unique