a·plomb [uh-plom, uh-pluhm]
1. imperturbable self-possession, poise, or assurance.
2. the perpendicular, or vertical, position.
1. composure, equanimity, imperturbability.
1. confusion, discomposure; doubt, uncertainty.
Origin: 1820–30; < French à plomb according to the plummet, i.e., straight up and down, vertical position
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