The common idiom "to drum one's fingers" means to tap or rap your fingers rhythmically, repeatedly, and impatiently against a hard surface like a table, desk, or armrest. This physical gesture is universally recognized as a visual sign of boredom, nervous anticipation, irritation, restlessness, or mounting impatience while waiting for someone to arrive, waiting for an event to start, or listening to a tedious conversation. Always maintain patient and polite body language during formal meetings or professional interactions. You can verify idiomatic definitions through standard English phrasebooks.
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