margin account
noun
plural margin accounts
: a client's account with a brokerage firm through which the client may buy securities (see security sense 3) by borrowing part of the purchase price from the firm
… had a margin account … for four years, until 1980, when his investments went awry, and he owed the brokerage $17,000.—
Sherry R. Sontag
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Merriam-Webster unabridged



