A synonym for fill in depends on the specific sense you mean, as fill in is a phrasal verb with several meanings. When fill in means to provide information or update someone, synonyms include brief, update, inform, apprise, clue in, bring up to speed, bring up to date, and enlighten. For example, instead of fill me in on the meeting, you could say update me on the meeting. When fill in means to complete a form or blanks, synonyms include complete, fill out, answer, supply, and provide. When fill in means to substitute for someone temporarily, synonyms include substitute, stand in, cover for, replace, take over for, pinch-hit, and sub. When fill in means to add material to fill a gap, synonyms include fill, plug, patch, and fill up. So the best synonym depends on context. For information sharing, brief and update are most common. For forms, complete is best. For substitution, stand in or substitute is best. Choosing the right synonym ensures clarity and matches the intended nuance.
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