In everyday usage, a widow maker is the name of an artery with blockage that often causes death by severe heart attack, but in finance, a widow maker is an extremely risky investment that subjects the investor to very large potential losses. Futures in heating oil and gasoline are an example of a type of investment that can be subject to the moniker "widow maker."
The wise investor will look at a highly speculative investment as a gambling venture and mitigate risk accordingly. Risk mitigation strategies might include investing only a small percentage of total assets in the speculative "investment" or implementing trading strategies that limit losses.
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widow maker n AmE infml This job is sure a widow maker Это очень опасная работа Don't touch this stuff, it's a widow maker from the look of it Не пей это, а то боюсь, ты коньки отбросишь... смотреть
n AmE infml This job is sure a widow maker — Это очень опасная работа Don't touch this stuff, it's a widow maker from the look of it — Не пей это, а то боюсь, ты коньки отбросишь... смотреть
(n) угрожающее жизни