through thick and thin

:  having or being of relatively great depth or extent from one surface to its opposite

:  heavily built :  thickset

:  close-packed with units or individuals

:  in a thick manner :  thickly

:  the most crowded or active part

:  the part of greatest thickness

:  having little extent from one surface to its opposite

:  measuring little in cross section or diameter

:  not dense in arrangement or distribution

:  to make thin or thinner:

:  to reduce in thickness or depth :  attenuate

:  to make less dense or viscous

:  in a thin manner :  thinly