| 词组 | flat as a tack |
| 释义 | (as) flat as a tackDemoralized or unenergetic. She's been flat as a tack ever since she heard that she didn't get into her top choice school. flat as a tackin very low spirits or lacking in energy. informalThe idea underlying the expression is of a tack that has been hammered in so that none of it protrudes. |
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