tighten up
(skiing) To ski over a course of humps or bumps.
The substance resulting from exposure of myoglobin to oxygen, responsible for the red colour of meat.
collectively; in mass.
(transitive) To make sufficiently tight. / (transitive) To fix something or make it correct. / (intransitive) To become tense and restrained.
式の前に手すりのボルトを十分に締めてください。
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