STEP Hebrew Lexicon: זָכָה

1) to be clean, be pure, be clear

1a) (Qal)

1a1) to be clean, be pure

1a2) to be clear, be justified

1b) (Piel)

1b1) to make clean, make pure, keep clean, keep pure

1c) (Hithpael)

1c1) to cleanse

1c2) to make yourself clean, purify oneself