Antonyms for Quit (opposite meaning)
WordNet sense 1 (keep or maintain in unaltered condition; cause to remain or last):
continue, preserve, uphold, carry on, bear on
WordNet sense 2 (assume an office, duty, or title):
take office
WordNet sense 3 (remain behind):
stay
WordNet sense 4 (become a participant; be involved in):
enter, participate
From the ODE community, based on WordNet
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