The phrase "o k'd" is slang for "approved" or "agreed upon." Some synonyms for this phrase include "green-lit," "endorsed," "validated," "authorized," "sanctioned," and "acquiesced." These terms can be used interchangeably depending on the context and tone of the conversation. For example, if a proposal was green-lit, it suggests a more enthusiastic acceptance compared to if it was simply authorized. In any case, understanding synonyms for "o k'd" can expand one's vocabulary and help convey approval or agreement in a more varied and nuanced way.