Definition of levelling screw in English:

levelling screw

Line breaks: lev¦el|ling screw

noun

A screw, typically one of three, for adjusting part of a machine or instrument to a precise level.

Definition of levelling screw in:

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Word of the day flagitious
Pronunciation: fləˈdʒɪʃəs
adjective
(of a person or their actions) criminal; villainous